No legacy documention downloads available

**Your Godot version:**
Any version not covered. (All of them except 3.6 and Stable/Latest)

**Issue description:**
For any number of reasons, some users may prefer to be in older versions for a bit longer than usual. For whatever reason that may be, it is not possible for a user to casually download an offline manual for an older version that they still use.

Their only option as a casual user is to rely on the web manual, which holds all versions.

The alternative is to dig through the git history, clone it and compile the manual first. Which tends to be the realm of experts. That is, at least, from what I perceived after ten minutes of trying to hunt down an older build.

Offering downloads for all major version branches would likely suffice for the purpose of archived documentation.

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If I am wrong, and these archives DO exist, then perhaps a link to them in the Offline Documentation section would help.

**URL to the documentation page (if already existing):**
N/A

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Cheers and thank you for all your hard work over the years. <>)

Start at the Offline Documentation section and verify whether archived downloads exist for the older Godot versions described in the issue. Check how the existing Stable/Latest and 3.6 documentation downloads are linked; the work is complete when users can find downloads for the major version branches, or a clear link to existing archives.

Written by the indexing model from the issue text.