Unfortunately, the docs site code is...elaborate, and I don't think anyone could replicate the current site without a ton of effort from us. I don't see us open-sourcing that.
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[1] Well, other than perhaps and upload to bitbucket or github and slapping a LICENSE file on it, probably. It shouldn't involve any maintenance or development work, is what I mean.
I did find out about Git notes through this thread, which seems interesting.