docs: remove custom_dir setting

Author: jg-rp

mkdocs.yml

@@ -14,7 +14,6 @@ theme:
     - navigation.expand
   logo: img/droplet_white_liquid.svg
   favicon: img/favicon.ico
-  custom_dir: docs/.overrides
 
 repo_name: jg-rp/liquid
 repo_url: https://github.com/jg-rp/liquid