Kiwix basically provides this. You can use kiwix-serve to serve the downloaded zim files locally.
I tried to add kiwix support to Offpunk in the early days but kiwix do not support incremental update of the wikipedia database, which makes it a huge pain point.
alt Hacker News
I tried to add kiwix support to Offpunk in the early days but kiwix do not support incremental update of the wikipedia database, which makes it a huge pain point.