docs: versions is out-of-date
We haven't really been updating the content our "versions" document in a long time.
See here: https://docs.mesa3d.org/versions.html
The last time new information was added to this document was in 1d07552b, back in 2016. That's over 4 years ago. This documents up to Mesa 12.x. A lot has happened since then; we've fully caught up with OpenGL 4.6, we've introduced Vulkan drivers etc.
If we have no interest in keeping this list up to date, and nobody seems to complain if we do, perhaps we should point to the Git history or release-notes archive here instead?
I dunno, thoughts?