That's an interesting problem, a multi community "community" like this site doesn't have a general sidebar/landing page/information page or anything like that. Nesting it in a /c/ means that people have to know where to find ot before they look, and you wind up with probably an endless stream of "best monero wallet" questions with responses telling you to look in the !monero sidebar.
Maybe the about section could be used for this kind of stuff?
Now that I've gotten into the flow of Lemmy, I realize I will never see these sidebars since my lemmy client doesn't actually visit the monero.town domain.
I think a wiki makes sense here, or lemmy should have the ability to pain a thread in a community.