Amirouche suggested using ordinary markdown files in a Git repo instead of GitHub's wiki since it's easier to manage things with pull requests and edit locally. That may be better for the long run.
I support that opinion, I would also prefer Markdown (or Org-mode) to GH Wiki.
OK, let's do that then :) As far as I can tell, the rest of us are fine with any option - no-one feels strongly that the GH Wiki is the way to go.
Feel free to move stuff from the wiki into markdown/org if you need to.
I don't really know which is more favored or standard in the
Scheme community, org or markdown. I personally only know markdown
(and ASCIIDoc, which IMHO is like a grown-up version of Markdown)
but probably org is not too complex.