added tab feature

mkdocs.yml

@@ -31,6 +31,10 @@ plugins:
           annotations_path: brief
           show_root_heading: true
           group_by_category: true
+markdown_extensions:
+- pymdownx.superfences
+- pymdownx.tabbed:
+    alternate_style: true
 site_name: docforge
 nav:
 - Home: index.md