Tabs and fix for subsection index

Author: vivekkpatel

mkdocs.yml

@@ -82,6 +82,8 @@ theme:
     - content.action.view # Allows "View on GitHub" links
     - content.code.copy # Allows code blocks to have a copy button
     - navigation.path # Enables path navigation top of docs for smaller screens
+    - navigation.tabs # Enables tabbed navigation
+    - navigation.indexes # Enables attachment of sub section index 
   icon:
     repo: fontawesome/brands/git-alt 
     edit: material/pencil