build: switch governor to system time

tranquil-store: make it seem a little less 'experimental'

fix(api): dont do rotation key validation in signPlcOperation as it blocks migrations

feat(docs): explain our definition of "correct PDS implementation"

feat(config): add more default crawlers/relays

fix(api): dont verify signature or DID during importRepo

feat(test): test that websockets get closed

feat(tranquil-store): gc and hardening