- Broke out cache status into a separate lexicon
- Made cache attestor method a non-main def in the lexicon

This doesn't necessarily have to be final all around, but this should be enough that we can start working with the lexicon w/ Quickslice and such

The readme is not really representative of my current direction with the project. This should fix that.

- Once again failed to name `com.atproto.repo.strongRef` properly

- Fixed incorrectly named references to `com.atproto.repo.strongRef`
- Fixed `world.geocache.visit#attestationRef` to actually point to a record properly
- Added "key" field to `world.geocache.user.profile` and `world.geocache.visit`