Use Hugo Extended in GitHub Pages workflow

Author: tobihagemann

.github/workflows/gh-pages.yml

@@ -18,6 +18,7 @@ jobs:
       uses: peaceiris/actions-hugo@v3
       with:
         hugo-version: '0.148.1'
+        extended: true
     - uses: actions/setup-node@v4
       with:
         node-version: 22