Any GitHub wiki can be cloned by appending wiki.git to the repo url, so the clone url for
the repo https://myorg/myrepo/ is: git@github.com:myorg/myrepo.wiki.git (for ssh) or https://github.com/my/myrepo.wiki.git (for https).
You make edits, and commit and push your changes, like any normal repo. This wiki repo
is distinct from any clone of the project repo (the repo without wiki.get appended).