Propose new RFC for migrating off Sympa.

Heads up @nathenharvey 

I will post to the mailing list (hehe) and hopefully we can get some comments & have this reviewed by the next community meeting.
Personally, I'm in favor of a static site and **not** migrating any messages.  This is an opportunity for us to hit the big reset button on the list.

Every previous attempt to migrate these messages to Google Groups has failed and is usually the point at which we've abandoned the work.