Specifically for wikis, is there a reason you wouldn't use Kiwix? For non "official" releases it's more complicated, but there are some services to generate the ZIM files. The desktop reader app is pretty good in my experience.

https://wiki.openzim.org/wiki/Build_your_ZIM_file

EDIT: https://get.kiwix.org/en/solutions/applications/kiwix-reader...