This article reminded me that many years ago I used to make PDF compilations of related Wikipedia articles using some tooling developed by PediaPress, and then read those offline on my laptop or iPad. I recently encountered one such compilation of cryptography & security related articles in my EBooks folder, and noticed the PediaPress metadata on the PDF. Apparently PediaPress is still around, and its tooling is still open source:
I also Google'd around a bit on this topic and it looks like there is an alternative set of tooling, wiki2book, focused on doing the same thing, but generating EPUBs that look good on e-reader devices. It also smartly doesn't require a modified/extended MediaWiki server, handling the quirks of the live Wikipedia instance specifically. Here is the info on that:
https://www.reddit.com/r/wikipedia/comments/189qqxe/wiki2boo...