Well by "wiki" it means to me that it saves history of changes and manage user access etc. That probably requires more complicated file setup than just markdown

Well by "wiki" it means to me that it saves history of changes and manage user access etc. That probably requires more complicated file setup than just markdown files. If you want just markdown > website with some administration to edit you can use pretty much any flat file CMS. Kirby CMS is highend but you need buy license. Grav is ok open-source option but i don't like the admin part too much but its atleast active. You can find many more https://github.com/ahadb/flat-file-cms https://github.com/ahadb/flat-file-cms but flatfile cms often becomes pet project that people stop maintain so watch out for activity.