Remove multiversion actions.

.github/workflows/docs_workflow.yml

@@ -69,10 +69,6 @@ jobs:
           cd gh-pages
           # Create `.nojekyll` (if it doesn't already exist) for proper GH Pages configuration.
           touch .nojekyll
-          # Add `index.html` to point to the `main` branch automatically.
-          printf '<meta http-equiv="refresh" content="0; url=./main/index.html" />' > index.html
-          # Only replace `main` docs with latest changes. Docs for releases should be untouched.
-          rm -rf main
           # don't clobber existing release versions (in case we retroactively fixed them)
           cp -r -n ../_build/html/* .
           # Configure git using GitHub Actions credentials.