In support of #426. There's still a little bit of surrounding framework that expects these decision files, but I'm trying to split out changes.
Note I'm dropping affirming/abstaining, as well as the accepted date -- I'd be happy to copy-paste decisions into comments on PRs if it'd be helpful, but I thought maybe we could drop those from the repo given they aren't asked for in on new proposals. If we change our minds, we can always look at git history too.
Adopts new copyright and markdown toc checks.
The new toc check generates the toc header, so that's why all the md files changed (this had felt better to me for the long-term, more auto-generated content)
Jon Meow