We don't have an offline version, but maybe adding one would be useful. I would have to figure out how to safely scrape a snapshot of the wiki.
Vikings of Midgard isn't in all the downloads. I need to check and see which ones have it. The minimal packages don't have it, and I am not sure if any of the Linux packages currently do. It does have its own itch page also, at https://fenrir-lunaris.itch.io/vikings-of-midgard . I will make sure to link to that next time I update that help page. Thank you for mentioning it!