docs: update mkdocs configuration

- Add trailing comma in site URL configuration
- Specify custom theme directory for overrides
- Enhance pydantic and fieldz documentation settings
  with schema and inherited member support

Author: liblaf

template/.config/copier/mkdocs.yaml.jinja

@@ -7,7 +7,7 @@ site_url:
   !ENV [
     READTHEDOCS_CANONICAL_URL,
     SITE_URL,
-    "https://{{ github_user }}.github.io/{{ github_repo }}/"
+    "https://{{ github_user }}.github.io/{{ github_repo }}/",
   ]
 site_author: "{{ author_name }}"
 repo_name: "{{ github_user }}/{{ github_repo }}"
@@ -27,6 +27,7 @@ extra_javascript:
 
 theme:
   name: material
+  custom_dir: docs/overrides/
   features:
     # - announce.dismiss
     - content.action.edit
@@ -116,11 +117,13 @@ plugins:
           extensions:
             # Official extensions
             - griffe_inherited_docstrings
-            - griffe_pydantic
+            - griffe_pydantic:
+                schema: true
             - griffe_warnings_deprecated
             # Third-party extensions
             - docstring_inheritance.griffe
-            - griffe_fieldz
+            - griffe_fieldz:
+                include_inherited: true
             - griffe_generics
             # - griffe_inherited_method_crossrefs # does not work
           find_stubs_package: true