TSC repo is cleaned up

[jepfp]

https://github.com/typelevel/tsc

[reardonj]

A number of the files in the root of this repo strike me as properly @typelevel/board documents:

• ADVISORS.md (is this still a thing?)
• ANTITRUST.md
• CHARTER.md (this is obsolete?)
• TRADEMARKS.md

Does the @typelevel/coc have a repo? CODE-OF-CONDUCT.md and ENFORCEMENT-POLICY.md are both on the website. So these should be out of this repository regardless, well, the enforcement policy at least. I guess the CoC can stay here since it does still apply to our activities here.