mkdocs: Enable admonition

mkdocs.yml

@@ -1,8 +1,10 @@
 site_name: c3voc Handbook
+site_url: https://c3voc-docs.staging.jtbx.de
 repo_url: https://git.hamburg.ccc.de/jtbx/c3voc-docs
 copyright: CC BY 4.0
 markdown_extensions:
   - smarty
+  - admonition
 
 theme:
   name: shadcn
@@ -17,6 +19,11 @@ theme:
   show_datetime: false
 # theme:
 #   name: material
+#   features:
+#     - navigation.sections
+#     # - navigation.expand
+#     - navigation.path
+#     - navigation.indexes
 #   plugins:
 #     # - optimize # TODO: needs additional dependencies, see https://squidfunk.github.io/mkdocs-material/plugins/requirements/image-processing/
 #   palette: