You can get the raw article text from fandom by clicking the edit button. Then you need to convert it from wikitext to markdown, there are varioustools for that. Finally post it on Ibis. Fandom also has an API, so you could write a script to automate all this.
Except where otherwise permitted, the text on Fandom communities (known as “wikis”) is licensed under the Creative Commons Attribution-Share Alike License 3.0 (Unported) (CC BY-SA).
This is a cute idea but I've generally been satisfied with the idea of using Gitit. That's a wiki backed by a git repo, so you can use normal git commands to propagate updates between servers. https://github.com/jgm/gitit or "apt install gitit".