Update Jekyll workflow to use actions/cache for gem caching

.github/workflows/jekyll.yml

@@ -38,45 +38,26 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
+      - name: Checkout main branch
         uses: actions/checkout@v4
         with:
           ref: "main"
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@8575951200e472d5f2d95c625da0c7bec8217c42 # v1.161.0
+      - uses: actions/cache@v3
         with:
-          ruby-version: "3.1" # Not needed with a .ruby-version file
-          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: Build with Jekyll
-        # Outputs to the './_site' directory by default
-        run: bundle exec jekyll build --baseurl "${{ steps.pages.outputs.base_path }}"
-        env:
-          JEKYLL_ENV: production
+          path: vendor/bundle
+          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-gems-
 
   # Deployment job
   deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
     runs-on: ubuntu-latest
     needs: build
     steps:
       - name: Checkout main branch
         uses: actions/checkout@v4
         with:
           ref: "main"
-      - name: Copy _site contents
-        run: |
-          cp -r _site/ Gemfile _config.yml /tmp/
-          git checkout -b _site
-          rm -rf *
-          cp -r /tmp/_site/* /tmp/Gemfile /tmp/_config.yml ./
-          git add --all
-          git config user.name github-actions
-          git config user.email [email protected]
-          git commit -m "update _site content"
-          git push --force origin _site
       - name: Deploy to GitHub Pages
         uses: jeffreytse/[email protected]
         with: