Enable navigation expansion in mkdocs.yml

Added the 'navigation.expand' feature to the mkdocs configuration. This will allow navigation menus to expand, improving the user experience when browsing the site.

Author: lipemorais

Diff for: mkdocs.yml

@@ -8,6 +8,7 @@ theme:
   features:
     - navigation.tabs
     - navigation.sections
+    - navigation.expand
     - toc.integrate
     - navigation.top
     - search.suggest