I have created a reasonably complete and well-functioning offline version of the wiki documentation, along with instructions for how to produce your own copy should this one become out of date (see munge.py).
Downloading the wiki without triggering a rate limiting error takes several hours, but putting together a usable offline copy from the downloaded files is completely automated and should take only a few seconds.
You can download an offline version of wiki.libsdl.org here:
https://files.pineapplemachine.com/public/sdl/wiki/offline-archive/wiki.libsdl.org.2020.06.23.zip
You can grab just the munge.py script and instructions on how to use it to produce a local copy here:
https://files.pineapplemachine.com/public/sdl/wiki/offline-archive/munge.py
I wasn’t able to find a license for the wiki content, but I’m going to operate on the assumption that either the license once mentioned here is still valid, or else that the intention hasn’t changed and no one will mind that I’m modifying and redistributing wiki content.