Clean up root move CODEOWNERS to .github directory

https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#codeowners-file-location

Author: jbampton

CODEOWNERS .github/CODEOWNERSCODEOWNERS renamed to .github/CODEOWNERS

@@ -16,7 +16,6 @@ plugins:
   - jekyll-feed
   - jekyll-sitemap
 exclude:
-  - CODEOWNERS
   - Gemfile
   - Gemfile.lock
   - README.md