diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c20a8bd..39d7623 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,20 +29,6 @@ jobs:
         with:
           ruby-version: '2.6.x'
 
-      - name: Install tools (for Ubuntu)
-        if: matrix.os == 'ubuntu-latest'
-        run: |
-          sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64
-          sudo add-apt-repository ppa:rmescandon/yq
-          sudo apt update
-          sudo apt install yq -y
-
-      - name: Install tools (for macOS)
-        if: matrix.os == 'macos-latest'
-        run: |
-          brew install coreutils
-          brew install yq
-
       - name: Checkout
         uses: actions/checkout@v2
         with:
@@ -73,7 +59,7 @@ jobs:
 
       - name: Build Site
         run: |
-          bash tools/build.sh
+          JEKYLL_ENV=production bundle exec jekyll b
 
       - name: Test Site
         run: |
diff --git a/.github/workflows/pages-deploy.yml.hook b/.github/workflows/pages-deploy.yml.hook
index e84439f..322f5e0 100644
--- a/.github/workflows/pages-deploy.yml.hook
+++ b/.github/workflows/pages-deploy.yml.hook
@@ -21,13 +21,6 @@ jobs:
         with:
           ruby-version: 2.6.x
 
-      - name: Install tools
-        run: |
-          sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys CC86BB64
-          sudo add-apt-repository ppa:rmescandon/yq
-          sudo apt update
-          sudo apt install yq -y
-
       - name: Checkout
         uses: actions/checkout@v2
         with:
@@ -58,19 +51,19 @@ jobs:
 
       - name: Check baseurl
         run: |
-          baseurl="$(grep '^baseurl:' _config.yml | yq r - baseurl)"
+          baseurl="$(grep '^baseurl:' _config.yml | sed "s/.*: *//;s/['\"]//g;s/#.*//")"
           if [[ -n $baseurl ]]; then
             echo "SPEC_TEST=_site_no_baseurl" >> $GITHUB_ENV
           fi
 
       - name: Build Site
         run: |
-          bash tools/build.sh
+          JEKYLL_ENV=production bundle exec jekyll b
 
           if [[ -n $SPEC_TEST ]]; then
             # Bypass the defects of htmlproofer
-            bash tools/build.sh -b "" -d "$SPEC_TEST"
-          fi          
+            JEKYLL_ENV=production bundle exec jekyll b -b "" -d "$SPEC_TEST"
+          fi
 
       - name: Test Site
         run: |
diff --git a/.travis.yml b/.travis.yml
index 684dde6..53b4052 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,11 +12,8 @@ install:
 
 addons:
   apt:
-    sources:
-      - sourceline: "ppa:rmescandon/yq"
     packages:
       - libcurl4-openssl-dev # required to avoid SSL error (for htmlproofer)
-      - yq
 
 script:
   - git -C "$HOME" clone "$BUILDER_REPO" --depth=1 -q
diff --git a/_scripts/sh/create_pages.sh b/_scripts/sh/create_pages.sh
deleted file mode 100755
index c2cf292..0000000
--- a/_scripts/sh/create_pages.sh
+++ /dev/null
@@ -1,159 +0,0 @@
-#!/usr/bin/env bash
-#
-# Create HTML pages for Categories and Tags in posts.
-#
-# Usage:
-#     Call from the '_posts' sibling directory.
-#
-# v2.2
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# Published under MIT License
-
-set -eu
-
-TYPE_CATEGORY=0
-TYPE_TAG=1
-
-category_count=0
-tag_count=0
-
-_read_yaml() {
-  local _endline="$(grep -n "\-\-\-" "$1" | cut -d: -f 1 | sed -n '2p')"
-  head -"$_endline" "$1"
-}
-
-read_categories() {
-  local _yaml="$(_read_yaml "$1")"
-  local _categories="$(echo "$_yaml" | yq r - "categories.*")"
-  local _category="$(echo "$_yaml" | yq r - "category")"
-
-  if [[ -n $_categories ]]; then
-    echo "$_categories"
-  elif [[ -n $_category ]]; then
-    echo "$_category"
-  fi
-}
-
-read_tags() {
-  local _yaml="$(_read_yaml "$1")"
-  local _tags="$(echo "$_yaml" | yq r - "tags.*")"
-  local _tag="$(echo "$_yaml" | yq r - "tag")"
-
-  if [[ -n $_tags ]]; then
-    echo "$_tags"
-  elif [[ -n $_tag ]]; then
-    echo "$_tag"
-  fi
-}
-
-init() {
-
-  if [[ -d categories ]]; then
-    rm -rf categories
-  fi
-
-  if [[ -d tags ]]; then
-    rm -rf tags
-  fi
-
-  if [[ ! -d _posts ]]; then
-    exit 0
-  fi
-
-  mkdir categories tags
-}
-
-create_category() {
-  if [[ -n $1 ]]; then
-    local _name=$1
-    local _filepath="categories/$(echo "$_name" | sed 's/ /-/g' | awk '{print tolower($0)}').html"
-
-    if [[ ! -f $_filepath ]]; then
-      echo "---" > "$_filepath"
-      echo "layout: category" >> "$_filepath"
-      echo "title: $_name" >> "$_filepath"
-      echo "category: $_name" >> "$_filepath"
-      echo "---" >> "$_filepath"
-
-      ((category_count = category_count + 1))
-    fi
-  fi
-}
-
-create_tag() {
-  if [[ -n $1 ]]; then
-    local _name=$1
-    local _filepath="tags/$(echo "$_name" | sed "s/ /-/g;s/'//g" | awk '{print tolower($0)}').html"
-
-    if [[ ! -f $_filepath ]]; then
-
-      echo "---" > "$_filepath"
-      echo "layout: tag" >> "$_filepath"
-      echo "title: $_name" >> "$_filepath"
-      echo "tag: $_name" >> "$_filepath"
-      echo "---" >> "$_filepath"
-
-      ((tag_count = tag_count + 1))
-    fi
-  fi
-}
-
-#########################################
-# Create HTML pages for Categories/Tags.
-# Arguments:
-#   $1 - an array string
-#   $2 - type specified option
-#########################################
-create_pages() {
-  if [[ -n $1 ]]; then
-    # split string to array
-    IFS_BAK=$IFS
-    IFS=$'\n'
-    local _string=$1
-
-    case $2 in
-
-      $TYPE_CATEGORY)
-        for i in $_string; do
-          create_category "$i"
-        done
-        ;;
-
-      $TYPE_TAG)
-        for i in $_string; do
-          create_tag "$i"
-        done
-        ;;
-
-      *) ;;
-
-    esac
-
-    IFS=$IFS_BAK
-  fi
-
-}
-
-main() {
-
-  init
-
-  for _file in $(find "_posts" -type f \( -iname \*.md -o -iname \*.markdown \)); do
-    local _categories=$(read_categories "$_file")
-    local _tags=$(read_tags "$_file")
-
-    create_pages "$_categories" $TYPE_CATEGORY
-    create_pages "$_tags" $TYPE_TAG
-  done
-
-  if [[ $category_count -gt 0 ]]; then
-    echo "[INFO] Succeed! $category_count category-pages created."
-  fi
-
-  if [[ $tag_count -gt 0 ]]; then
-    echo "[INFO] Succeed! $tag_count tag-pages created."
-  fi
-}
-
-main
diff --git a/_scripts/sh/dump_lastmod.sh b/_scripts/sh/dump_lastmod.sh
deleted file mode 100755
index 400494c..0000000
--- a/_scripts/sh/dump_lastmod.sh
+++ /dev/null
@@ -1,88 +0,0 @@
-#!/bin/bash
-#
-# Find out the posts that have been modified and record
-# its lastmod information to file '_data/updates.yml'
-#
-# Usage:
-#     Call from the '_posts' sibling directory.
-#
-# v2.2
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# Published under MIT License
-
-set -eu
-
-POST_DIR=_posts
-OUTPUT_DIR=_data
-OUTPUT_FILE=updates.yml
-
-_init() {
-
-  if [[ ! -d "$OUTPUT_DIR" ]]; then
-    mkdir "$OUTPUT_DIR"
-  fi
-
-  if [[ -f "$OUTPUT_DIR/$OUTPUT_FILE" ]]; then
-    rm -f "$OUTPUT_DIR/$OUTPUT_FILE"
-  fi
-
-  if [[ ! -d $POST_DIR ]]; then
-    exit 0
-  fi
-}
-
-_has_changed() {
-  local _log_count="$(git log --pretty=%ad "$1" | wc -l | sed 's/ *//')"
-  _log_count=$((_log_count + 0))
-
-  if [[ $_log_count > 1 ]]; then
-    return 0 # true
-  fi
-
-  return 1 # false
-}
-
-###################################
-# Storage the posts' lastmod.
-#
-# Args:
-#     - $1 the post's filename
-#     - $2 the post's filepath
-# Output:
-#     the file '_data/updates.yml'
-###################################
-_dump() {
-  local _lasmod="$(git log -1 --pretty=%ad --date=iso "$2")"
-
-  if [[ ! -f "$OUTPUT_DIR/$OUTPUT_FILE" ]]; then
-    touch "$OUTPUT_DIR/$OUTPUT_FILE"
-  fi
-
-  echo "-" >> "$OUTPUT_DIR/$OUTPUT_FILE"
-  echo "  filename: '$1'" >> "$OUTPUT_DIR/$OUTPUT_FILE"
-  echo "  lastmod: '$_lasmod'" >> "$OUTPUT_DIR/$OUTPUT_FILE"
-}
-
-main() {
-
-  _init
-
-  local _count=0
-
-  for _file in $(find ${POST_DIR} -type f \( -iname \*.md -o -iname \*.markdown \)); do
-    _filename="$(basename "$_file" | sed 's/-\-\+/-/;s/[[:digit:]]\([[:digit:]]*-\)//g;s/\..*//')" # remove date and extension
-
-    if _has_changed "$_file"; then
-      _dump "$_filename" "$_file"
-      ((_count = _count + 1))
-    fi
-
-  done
-
-  if [[ $_count > 0 ]]; then
-    echo "[INFO] Success to update lastmod for $_count post(s)."
-  fi
-}
-
-main
diff --git a/_scripts/sh/sync_monitor.sh b/_scripts/sh/sync_monitor.sh
deleted file mode 100644
index 9f58200..0000000
--- a/_scripts/sh/sync_monitor.sh
+++ /dev/null
@@ -1,37 +0,0 @@
-#!/bin/bash
-
-# Files sync monitor
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT Licensed
-
-# $1 -> the origin file with absolute path.
-# $2 -> the origin sync directory
-# $3 -> the destination sync directory
-
-# Omit the system temp file
-if [[ ! -f $1 ]]; then
-  exit 0
-fi
-
-src_dir="$(dirname "$(realpath "$1")")"
-
-dir_prefix="$(realpath "$2")/"
-
-related_dir="${src_dir:${#dir_prefix}}"
-
-dest="$(realpath "$3")/${related_dir}"
-
-if [[ ! -d $dest ]]; then
-  mkdir -p "$dest"
-fi
-
-if [[ -f $1 ]]; then
-  cp "$1" "$dest"
-fi
-
-if [[ $related_dir == "_posts" ]]; then
-  bash "$3"/_scripts/sh/create_pages.sh
-  bash "$3"/_scripts/sh/dump_lastmod.sh
-fi
diff --git a/assets/js/data/cache-list.js b/assets/js/data/cache-list.js
index df6f7d2..90b469e 100644
--- a/assets/js/data/cache-list.js
+++ b/assets/js/data/cache-list.js
@@ -40,34 +40,6 @@ const include = [
     '{{ item | relative_url }}',
   {% endfor %}
 
-  /* The posts of first Home page and recent update list */
-  {% assign post_list = "" | split: "" %}
-
-  {% for post in site.posts limit: site.paginate %}
-    {% capture post_url %}{{ post.url | relative_url }}{% endcapture %}
-    {% assign post_list = post_list | push: post_url %}
-  {% endfor %}
-
-  {% include update-list.html %}
-
-  {% for item in update_list %}
-    {% assign url = item | split: "::" | last | url_encode | prepend: "/posts/" | append: "/" | relative_url %}
-    {% assign post_list = post_list | push: url %}
-  {% endfor %}
-
-  {% assign post_list = post_list | uniq %}
-
-  {% for url in post_list %}
-    '{{ url }}',
-  {% endfor %}
-
-  /* Trending tags */
-  {% include trending-tags.html %}
-  {% for tag in trending_tags %}
-    {% capture tag_url %}/tags/{{ tag | downcase | url_encode }}/{% endcapture %}
-    '{{ tag_url | relative_url }}',
-  {% endfor %}
-
   /*--- Icons ---*/
 
   {%- capture icon_url -%}
diff --git a/tools/build.sh b/tools/build.sh
deleted file mode 100755
index 013cf15..0000000
--- a/tools/build.sh
+++ /dev/null
@@ -1,147 +0,0 @@
-#!/bin/bash
-#
-# Build jekyll site and store site files in ./_site
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# Published under MIT License
-
-set -eu
-
-WORK_DIR="$(dirname "$(dirname "$(realpath "$0")")")"
-
-CONTAINER="${WORK_DIR}/.container"
-
-dest="${WORK_DIR}/_site"
-
-cmd="JEKYLL_ENV=production bundle exec jekyll b"
-
-docker=false
-
-config=""
-
-_help() {
-  echo "Usage:"
-  echo
-  echo "   bash build.sh [options]"
-  echo
-  echo "Options:"
-  echo "  -b, --baseurl     <URL>                  The site relative url that start with slash, e.g. '/project'"
-  echo "  -h, --help                               Print the help information"
-  echo "  -d, --destination <DIR>                  destination directory (defaults to ./_site)"
-  echo "      --docker                             Build site within docker"
-  echo "      --config      <CONFIG_a[,CONFIG_b]>  Specify config files"
-}
-
-_install_tools() {
-  # docker image `jekyll/jekyll` based on Alpine Linux
-  echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
-  apk update
-  apk add yq
-}
-
-_init() {
-  cd "$WORK_DIR"
-
-  if [[ -f Gemfile.lock ]]; then
-    rm -f Gemfile.lock
-  fi
-
-  if [[ -d $CONTAINER ]]; then
-    rm -rf "$CONTAINER"
-  fi
-
-  if [[ -d $dest ]]; then
-    bundle exec jekyll clean
-  fi
-
-  local _temp="$(mktemp -d)"
-  cp -r ./* "$_temp"
-  cp -r ./.git "$_temp"
-  mv "$_temp" "$CONTAINER"
-}
-
-_build() {
-  cd "$CONTAINER"
-  echo "$ cd $(pwd)"
-
-  bash "_scripts/sh/create_pages.sh"
-  bash "_scripts/sh/dump_lastmod.sh"
-
-  cmd+=" -d $dest"
-
-  if [[ -n $config ]]; then
-    cmd+=" --config $config"
-  fi
-
-  echo "\$ $cmd"
-  eval "$cmd"
-  echo -e "\nBuild success, the site files have been placed in '${dest}'."
-
-  if [[ -d "${dest}/.git" ]]; then
-    if [[ -n $(git -C "$dest" status -s) ]]; then
-      git -C "$dest" add .
-      git -C "$dest" commit -m "[Automation] Update site files." -q
-      echo -e "\nPlease push the changes of $dest to remote master branch.\n"
-    fi
-  fi
-
-  cd .. && rm -rf "$CONTAINER"
-}
-
-_check_unset() {
-  if [[ -z ${1:+unset} ]]; then
-    _help
-    exit 1
-  fi
-}
-
-main() {
-  while [[ $# -gt 0 ]]; do
-    opt="$1"
-    case $opt in
-      -b | --baseurl)
-        local _baseurl="$2"
-        if [[ -z $_baseurl ]]; then
-          _baseurl='""'
-        fi
-        cmd+=" -b $_baseurl"
-        shift
-        shift
-        ;;
-      -d | --destination)
-        _check_unset "$2"
-        dest="$(realpath "$2")"
-        shift
-        shift
-        ;;
-      --docker)
-        docker=true
-        shift
-        ;;
-      --config)
-        _check_unset "$2"
-        config="$(realpath "$2")"
-        shift
-        shift
-        ;;
-      -h | --help)
-        _help
-        exit 0
-        ;;
-      *) # unknown option
-        _help
-        exit 1
-        ;;
-    esac
-  done
-
-  if $docker; then
-    _install_tools
-  fi
-
-  _init
-  _build
-}
-
-main "$@"
diff --git a/tools/run.sh b/tools/run.sh
deleted file mode 100755
index ca11733..0000000
--- a/tools/run.sh
+++ /dev/null
@@ -1,188 +0,0 @@
-#!/bin/bash
-
-# Run jekyll site at http://127.0.0.1:4000
-#
-# Requirement:
-#   Option '-r, --realtime' needs fswatch › http://emcrisostomo.github.io/fswatch/
-#
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# Published under MIT License
-
-set -eu
-
-WORK_DIR="$(dirname "$(dirname "$(realpath "$0")")")"
-
-CONTAINER="${WORK_DIR}/.container"
-SYNC_TOOL=_scripts/sh/sync_monitor.sh
-
-cmd="bundle exec jekyll s"
-JEKYLL_DOCKER_HOME="/srv/jekyll"
-
-realtime=false
-docker=false
-
-_help() {
-  echo "Usage:"
-  echo
-  echo "   bash run.sh [options]"
-  echo
-  echo "Options:"
-  echo "     -H, --host    <HOST>    Host to bind to"
-  echo "     -P, --port    <PORT>    Port to listen on"
-  echo "     -b, --baseurl <URL>     The site relative url that start with slash, e.g. '/project'"
-  echo "     -h, --help              Print the help information"
-  echo "     -t, --trace             Show the full backtrace when an error occurs"
-  echo "     -r, --realtime          Make the modified content updated in real time"
-  echo "         --docker            Run within docker"
-}
-
-_cleanup() {
-  rm -rf "$CONTAINER"
-  ps aux | grep fswatch | awk '{print $2}' | xargs kill -9 > /dev/null 2>&1
-}
-
-_setup_docker() {
-  # docker image `jekyll/jekyll` based on Alpine Linux
-  echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
-  ## CN Apline sources mirror
-  # sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories
-  apk update
-  apk add yq
-}
-
-_init() {
-  cd "$WORK_DIR"
-
-  if [[ -f Gemfile.lock ]]; then
-    rm -f Gemfile.lock
-  fi
-
-  if [[ -d $CONTAINER ]]; then
-    rm -rf "$CONTAINER"
-  fi
-
-  mkdir "$CONTAINER"
-  cp -r ./* "$CONTAINER"
-  cp -r ./.git "$CONTAINER"
-
-  if $docker; then
-    local _image_user=$(stat -c "%U" "$JEKYLL_DOCKER_HOME"/.)
-
-    if [[ $_image_user != $(whoami) ]]; then
-      # under Docker for Linux
-      chown -R "$(stat -c "%U:%G" "$JEKYLL_DOCKER_HOME"/.)" "$CONTAINER"
-    fi
-
-  fi
-
-  trap _cleanup INT
-}
-
-_check_unset() {
-  if [[ -z ${1:+unset} ]]; then
-    _help
-    exit 1
-  fi
-}
-
-_check_command() {
-  if [[ -z $(command -v "$1") ]]; then
-    echo "Error: command '$1' not found !"
-    echo "Hint: Get '$1' on <$2>"
-    exit 1
-  fi
-}
-
-_run() {
-  cd "$CONTAINER"
-  bash _scripts/sh/create_pages.sh
-  bash _scripts/sh/dump_lastmod.sh
-
-  if $realtime; then
-
-    exclude_regex="\/\..*"
-
-    if [[ $OSTYPE == "darwin"* ]]; then
-      exclude_regex="/\..*" # darwin gcc treat regex '/' as character '/'
-    fi
-
-    fswatch -e "$exclude_regex" -0 -r \
-      --event Created --event Removed \
-      --event Updated --event Renamed \
-      --event MovedFrom --event MovedTo \
-      "$WORK_DIR" | xargs -0 -I {} bash "./${SYNC_TOOL}" {} "$WORK_DIR" . &
-  fi
-
-  if $docker; then
-    cmd+=" -H 0.0.0.0"
-  else
-    cmd+=" -l -o"
-  fi
-
-  echo "\$ $cmd"
-  eval "$cmd"
-}
-
-main() {
-  if $docker; then
-    _setup_docker
-  fi
-
-  _init
-  _run
-}
-
-while (($#)); do
-  opt="$1"
-  case $opt in
-    -H | --host)
-      _check_unset "$2"
-      cmd+=" -H $2"
-      shift # past argument
-      shift # past value
-      ;;
-    -P | --port)
-      _check_unset "$2"
-      cmd+=" -P $2"
-      shift
-      shift
-      ;;
-    -b | --baseurl)
-      _check_unset "$2"
-      if [[ $2 == \/* ]]; then
-        cmd+=" -b $2"
-      else
-        _help
-        exit 1
-      fi
-      shift
-      shift
-      ;;
-    -t | --trace)
-      cmd+=" -t"
-      shift
-      ;;
-    -r | --realtime)
-      _check_command fswatch "http://emcrisostomo.github.io/fswatch/"
-      realtime=true
-      shift
-      ;;
-    --docker)
-      docker=true
-      shift
-      ;;
-    -h | --help)
-      _help
-      exit 0
-      ;;
-    *)
-      # unknown option
-      _help
-      exit 1
-      ;;
-  esac
-done
-
-main
diff --git a/tools/test.sh b/tools/test.sh
index 90dd701..0eda427 100755
--- a/tools/test.sh
+++ b/tools/test.sh
@@ -14,10 +14,45 @@
 DEST=_site
 URL_IGNORE=cdn.jsdelivr.net
 
+_build=false
+
+help() {
+  echo "Usage:"
+  echo
+  echo "   bash ./tools/test.sh [options]"
+  echo
+  echo "Options:"
+  echo "     --build              Run jekyll build before testing."
+  echo "     -h, --help           Print this information."
+}
+
 if [[ -n $1 && -d $1 ]]; then
   DEST=$1
 fi
 
+while (($#)); do
+  opt="$1"
+  case $opt in
+    --build)
+      _build=true
+      shift
+      ;;
+    -h | --help)
+      help
+      exit 0
+      ;;
+    *)
+      # unknown option
+      help
+      exit 1
+      ;;
+  esac
+done
+
+if $_build; then
+  JEKYLL_ENV=production bundle exec jekyll b
+fi
+
 bundle exec htmlproofer $DEST \
   --disable-external \
   --check-html \