actions: use GH's CI template instead

.github/workflows/gh-pages-deployment.yml

@@ -1,29 +1,75 @@
-name: GitHub Pages
+name: Deploy site
 
-on:                                              
+on:
+  # Runs on pushes targeting the default branch
   push:
-    branches:
-    - master
+    branches: ["main"]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+# Default to bash
+defaults:
+  run:
+    shell: bash
 
 jobs:
-  build-deploy:
-    runs-on: ubuntu-22.04
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    env:
+      HUGO_VERSION: 0.124.1
     steps:
-    - uses: actions/checkout@v1                  
-      with:
-        submodules: true
-
-    - name: Setup Hugo                           
-      uses: peaceiris/actions-hugo@v2
-      with:
-        hugo-version: '0.62.0'
-
-    - name: Build                                
-      run: hugo
-
-    - name: Deploy                               
-      uses: peaceiris/actions-gh-pages@v2
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        PUBLISH_BRANCH: gh-pages
-        PUBLISH_DIR: ./public
+      - name: Install Hugo CLI
+        run: |
+          wget -O ${{ runner.temp }}/hugo.deb https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/hugo_extended_${HUGO_VERSION}_linux-amd64.deb \
+          && sudo dpkg -i ${{ runner.temp }}/hugo.deb
+      - name: Install Dart Sass
+        run: sudo snap install dart-sass
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - name: Setup Pages
+        id: pages
+        uses: actions/configure-pages@v5
+      - name: Install Node.js dependencies
+        run: "[[ -f package-lock.json || -f npm-shrinkwrap.json ]] && npm ci || true"
+      - name: Build with Hugo
+        env:
+          # For maximum backward compatibility with Hugo modules
+          HUGO_ENVIRONMENT: production
+          HUGO_ENV: production
+        run: |
+          hugo \
+            --minify \
+            --baseURL "${{ steps.pages.outputs.base_url }}/"
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./public
+
+  # Deployment job
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4
+