chore: warn about WIP docs state

docs/overrides/main.html

@@ -0,0 +1,5 @@
+{% extends "base.html" %}
+
+{% block announce %}
+ 🚨The documentation is still a work in progress. Refer to the README for more information.🚨
+{% endblock %}

mkdocs.yml

@@ -26,6 +26,7 @@ validation:
 
 theme:
   name: "material"
+  custom_dir: docs/overrides
   features:
     - content.action.edit
     - content.action.view