docs: improve docs (backport #12647)

[mergify]

This is an automatic backport of pull request #12647 done by Mergify.
Cherry-pick of 987959c has failed:

On branch mergify/bp/release/v0.46.x/pr-12647
Your branch is up to date with 'origin/release/v0.46.x'.

You are currently cherry-picking commit 987959c54.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   docs/.vuepress/config.js
	modified:   docs/DOCS_README.md
	deleted:    docs/ko/README.md
	deleted:    docs/ru/README.md
	modified:   docs/versions
	deleted:    docs/zh/README.md

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   .github/workflows/deploy-docs.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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