add tabbed extension

Author: vvolkl

mkdocs-site/mkdocs.yml

@@ -32,6 +32,8 @@ markdown_extensions:
       permalink: true
   - tables
   - fenced_code
+  - pymdownx.tabbed:
+      alternate_style: true
   - pymdownx.superfences:
       custom_fences:
         - name: mermaid