Use strict mode

.gitea/workflows/deploy.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install mkdocs-material
         run: pip install mkdocs-material=="9.*"
       - name: Build documentation
-        run: mkdocs build
+        run: mkdocs build -s
       - name: Deploy documentation
         # the default mkdocs build output directory `/site` is gitignored
         # so it's safe to `git rm -rf .`