Cool. Some people complained about broken demos, I uploaded the mdwiki.info [1] website unaltered and seems to work fine [0]. MDwiki is a single .html file that fetches custom markdown via ajax relative to the html file and renders it via Javascript.
The idea is to host it on github, and people send changes to the content via pull requests (vs. editing like in wikipedia). There is no backend, just plain files.
[0]: https://peerweb.lol/?orc=b549f37bb4519d1abd2952483610b8078e6...
[1]: https://dynalon.github.io/mdwiki/