Simplify identity system - "just use eth"

[kayhhh]

I've been playing around with different identity options - handles, DIDs - but I think just using eth addresses is the simplest and best option. There is a benefit from being able to sign in with google or other socials, but its too much work for what its worth, especially at this stage of things. Will be good to narrow focus.

Plan is to remove the handle system, remove sign in with google, and resolve ENS names / profiles when available. We can still keep the profile system (profile picture, name, bio, etc). This will be used more as a fallback for people without ENS, as it is stored in the database, not accessible to other clients.

[kayhhh]

BUT I REFUSE

[kayhhh]

#800