[Docs] Fix Docs Unit Test (#5496)

* Update docset.yml

* Rename README.md to readme.md

* Update pyproject.toml

docs/docset.yml

@@ -3,7 +3,7 @@ cross_links:
   - docs-content
 exclude:
   - '_*.md'
-  - 'README.md'
+  - 'readme.md'
 
 extensions:
   - detection-rules
@@ -13,7 +13,7 @@ toc:
     detection_rules: ['../rules', '../rules_building_block']
   - folder: audit_policies/windows
     children:
-      - file: README.md
+      - file: readme.md
       - file: audit_authorization_policy_change.md
       - file: audit_computer_account_management.md
       - file: audit_detailed_file_share.md