Revert "Remove unused Slidev stuff"

This reverts commit 396f64a.

Author: dylanhand

.github/workflows/docsygen.yml

@@ -25,18 +25,62 @@ jobs:
         with:
           repository: giellalt/giellalt.github.io
 
+      - name: Install realpath
+        run: |
+          which realpath
+
+      - name: Setup Node.js for Slidev
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install Slidev and dependencies
+        run: |
+          npm install -g @slidev/cli
+          npm install -g @slidev/theme-default
+          npm install -g @slidev/theme-seriph
+          npm install -g playwright-chromium
+
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: '3.1'
           bundler-cache: true
 
+      - name: Build Slidev presentations
+        env:
+          CI: true
+          NODE_ENV: production
+        run: |
+          chmod +x build-slidev.sh
+          ./build-slidev.sh
+
       - name: Build Jekyll site
         env:
           JEKYLL_GITHUB_TOKEN: ${{ secrets.GIELLALT_DOCS_GH_TOKEN }}
         run: |
           bundle exec jekyll build
 
+      - name: Copy Slidev presentations to _site
+        run: |
+          echo "=== Copying Slidev presentations to _site ==="
+          find . -type d -name "*-slidev" -not -path "./_site/*" -not -path "./node_modules/*" -not -path "./.git/*" | while read -r slidev_dir; do
+            if [ -f "$slidev_dir/index.html" ]; then
+              target_dir="_site/$slidev_dir"
+              mkdir -p "$(dirname "$target_dir")"
+              cp -r "$slidev_dir" "$(dirname "$target_dir")/"
+              echo "Copied $slidev_dir to $target_dir"
+            fi
+          done
+          echo "=== Verifying Slidev presentations in _site ==="
+          find _site -type d -name "*-slidev" | while read -r dir; do
+            if [ -f "$dir/index.html" ]; then
+              echo "✓ Found $dir/index.html"
+            else
+              echo "✗ Missing index.html in $dir"
+            fi
+          done
+
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v5
         with: