I used to put all my setup & config notes into tiddlywiki, and to some point I still update them, but it’s become difficult for others to update and maintain when I share them as you need a browser addin to be able to save updates properly.

The formatting is similar to markdown, but just a little different to make copying the original source that way too… but… I’d still consider it, esp. once you’ve really played with it and found all the things it’s capable of.