Yes, we have a longstanding mediawiki installation: Making sure you're not a bot!
our Discourse forum: Discuss
And this hosted version of Pandoc we’ve encouraged users to use for quickly turning Markdown into the more esoteric mediawiki markup.
I’m hoping there is a way to turn this into a more automated workflow, as we want mediawiki pages from non-technical types who have enough trouble just registering an account.
Obviously we could do this within Discourse, but our mediawiki has been online since ~2007 and has a longstanding following, so no one wants to mess with it. But, it is a bit difficult / long in the tooth for drafting documentation in 2020. 
I’m not fully sure on next steps. But, this would be a big help to our pool of volunteers! So far I’ve discovered this restful api version of Pandoc, or the hosted demo linked above.