Debug GitHub Pages deployment structure

Author: merfanian

.github/workflows/deploy-books.yaml

@@ -61,6 +61,13 @@ jobs:
           # Copy demo build to docs/book/demo for serving
           mkdir -p docs/book/demo
           cp -r demo/build/* docs/book/demo/
+          # Verify the structure
+          echo "Documentation files:"
+          ls -la docs/book/
+          echo "Demo files:"
+          ls -la docs/book/demo/
+          # Ensure demo doesn't overwrite the main index.html
+          echo "Demo copied to /demo/ subdirectory"
       
       - name: Setup Pages
         uses: actions/configure-pages@v4