docs: enable TOC integration and sticky navigation tabs (#196)

Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: William Easton <[email protected]>

Author: strawgate

mkdocs.yml

@@ -24,10 +24,14 @@ theme:
         name: Switch to light mode
   features:
     - navigation.tabs
+    - navigation.tabs.sticky
     - navigation.sections
     - navigation.expand
     - navigation.top
     - navigation.tracking
+    - navigation.instant
+    - toc.integrate
+    - toc.follow
     - search.suggest
     - search.highlight
     - content.code.copy