add workflows

.github/workflows/ci.yml

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+on:
+    push:
+      branches:
+        - main
+    pull_request:
+      branches:
+        - main
+
+  name: CI
+
+  jobs:
+    jekyll-build:
+      name: Build (jekyll gem)
+      strategy:
+        fail-fast: false
+        matrix:
+          jekyll-version: [3.9, 4.3]
+          os: [ ubuntu-latest, macos-latest, windows-latest ]
+          ruby-version: ["3.1", "3.2", "3.3"]
+      runs-on: ${{ matrix.os }}
+      steps:
+      - uses: actions/checkout@v4
+      - name: Setup Ruby ${{ matrix.ruby-version }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+          bundler-cache: false
+      - name: Bundle Install (Jekyll ${{ matrix.jekyll-version }})
+        run: bundle install
+        env:
+          BUNDLE_GEMFILE: fixtures/Gemfile-jekyll-${{ matrix.jekyll-version }}
+      - name: Init Search
+        run: bundle exec rake search:init
+        env:
+          BUNDLE_GEMFILE: fixtures/Gemfile-jekyll-${{ matrix.jekyll-version }}
+      - name: Build Site
+        run: bundle exec jekyll build
+        env:
+          BUNDLE_GEMFILE: fixtures/Gemfile-jekyll-${{ matrix.jekyll-version }}
+
+    github-pages-build:
+      name: Build (github-pages gem)
+      runs-on: ubuntu-latest
+      steps:
+      - uses: actions/checkout@v4
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: "3.2"
+          bundler-cache: false
+      - name: Bundle Install
+        run: bundle install
+        env:
+          BUNDLE_GEMFILE: fixtures/Gemfile-github-pages
+      - name: Build Site
+        run: bundle exec jekyll build
+        env:
+          BUNDLE_GEMFILE: fixtures/Gemfile-github-pages
+
+    validate:
+      name: Validate HTML
+      strategy:
+        fail-fast: false
+        matrix:
+          ruby-version: ["3.2"]
+      runs-on: ubuntu-latest
+
+      steps:
+        - uses: actions/checkout@v4
+        - name: Setup Ruby ${{ matrix.ruby-version }}
+          uses: ruby/setup-ruby@v1
+          with:
+            ruby-version: ${{ matrix.ruby-version }}
+            bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+            cache-version: 0 # Increment this number if you need to re-download cached gems
+        - name: Cache HTMLProofer
+          id: cache-htmlproofer
+          uses: actions/cache@v3
+          with:
+            path: tmp/.htmlproofer
+            key: ${{ runner.os }}-htmlproofer
+        - name: Build Site
+          run: bundle exec jekyll build
+        - name: Test with Nu Validator
+          uses: Cyb3r-Jak3/html5validator-action@2a593a9f2c10593cbac84791a6fc4c47e9a106c8
+          with:
+            config: fixtures/html5validator-config.yml
+        - name: Test with html-proofer
+          run: bundle exec htmlproofer _site --ignore-urls "/github.com/,/web.archive.org/"
+          env:
+            NOKOGIRI_USE_SYSTEM_LIBRARIES: true
+
+    assets:
+      name: Test CSS and JS
+      runs-on: ubuntu-latest
+
+      strategy:
+        matrix:
+          node-version: [18.x]
+
+      steps:
+      - uses: actions/checkout@v4
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+      - run: npm install
+      - run: npm test  

.github/workflows/update_jekyll-anchor-heading.yml

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+name: Update Vendor plugin - jekyll-anchor-headings
+on:
+  # schedule:
+  #   # once per week
+  #   - cron: "0 15 * * 0"
+  workflow_dispatch:
+jobs:
+  update-deps:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Get latest release information
+        id: latest-release
+        uses: pozetroninc/github-action-get-latest-release@master
+        with:
+          owner: allejo
+          repo: jekyll-anchor-headings
+          excludes: prerelease, draft
+
+      - name: Update jekyll-anchor-headings
+        id: update
+        uses: suisei-cn/[email protected]
+        with:
+          url: "https://github.com/allejo/jekyll-anchor-headings/releases/download/${{ steps.latest-release.outputs.release }}/anchor_headings.html"
+          target: _includes/vendor/
+
+      - name: Create PR
+        uses: peter-evans/create-pull-request@v4
+        with:
+          commit-message: "chore[dependency]: Update `jekyll-anchor-headings` to `${{ steps.latest-release.outputs.release }}`"
+          title: "auto: Update `jekyll-anchor-headings` to `${{ steps.latest-release.outputs.release }}`"
+          body: |
+            Update `jekyll-anchor-headings` to `${{ steps.latest-release.outputs.release }}`
+            This is an automated pull request.
+          branch: update/vendor/jekyll-anchor-headings
+          delete-branch: true
+          labels: |
+            kind/update
+            area/dependency
+          add-paths: |
+            _includes/vendor/anchor_headings.html
+          token: ${{ secrets.GITHUB_TOKEN }}