Fix MkDocs docs build configuration

Agent-Logs-Url: https://github.com/Prescott-Data/nexus-framework/sessions/0ae80456-39aa-4037-9720-71f158a2e655

Co-authored-by: ekizito96 <87319861+ekizito96@users.noreply.github.com>

Author: Copilot

mkdocs.yml

@@ -10,7 +10,6 @@ site_dir: site
 
 theme:
   name: material
-  custom_dir: docs/overrides
   logo: assets/nexus-logo-blue.png
   favicon: assets/nexus-logo-blue.png
   palette: