ISSUE-17438: [Doc] Create an alias with version number to latest stable version

[sijie]

Original Issue: apache#17438

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• I searched in the issues and found nothing similar.

What issue do you find in Pulsar docs?

You can find docs for 2.9.x at: https://pulsar.apache.org/docs/2.9.x, for 2.10.1 at https://pulsar.apache.org/docs/2.10.1, but the latest stable version 2.10.x only lives at https://pulsar.apache.org/docs, not at https://pulsar.apache.org/docs/2.10.x.

This becomes a serious issue that users of the latest stable version can only share links to an unstable prefix https://pulsar.apache.org/docs, so that the result can change or the link can be broken later.

What is your suggestion?

We should generate a stable link for the latest stable version also.

cc @Anonymitaet @urfreespace

Any reference?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!