Show a warning in old docs

[sheremet-va]

Clear and concise description of the problem

Currently it's hard to notice you are reading an old documentation if you visited it by mistake.

Suggested solution

Show a banner in old docs with a text that warns the documentation is outdated. Example in Vite: vitejs/vite#18805

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.