Closing issues on the rfcs repo

[Manishearth]

The RFCs repo has a lot of open issues, but these are mostly ignored by the teams.

We should perhaps turn off issue-filing on the repo (maybe archiving existing issues by mass migrating them if necessary) and update the readme to redirect people to Internals.

[github-actions]

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[steveklabnik]

As someone who participated in the first migration... you fundamentally need to give people some scratch space. That could be internals, that could be here, whatever.

Honestly, I personally don't think internals is really used seriously by the teams; so I'd go the other way if I were running everything.

I don't super care about the specifics, just that some place like this should exist in some form.

[Manishearth]

Yeah, I think internals does function as this kind of scratch space, which the teams can pay attention to (but essentially ignore threads that are going off into weird territory).