With the documentation moved to a separate repo, remove the docs from this repository to avoid confusion where to contribute to docs. Also, removing a GH action and unpublishing the GH pages site with the docs being built on Render. Updated README and Contributing guide with the new docs repo.
deleted: .github/workflows/doc-build.yml
modified: README.md
deleted: docs/COMPARISON.md
deleted: docs/REFERENCE.md
deleted: docs/USER_GUIDE.md
deleted: docs/_images/percona-favicon.ico
deleted: docs/_images/percona-logo.svg
deleted: docs/css/percona.css
deleted: docs/css/toctree.css
deleted: docs/index.md
deleted: docs/js/version-select.js
deleted: docs/overrides/404.html
deleted: docs/setup.md
deleted: requirements-doc.txt