R1:7b40c616d6cd

Refactor user settings

Summary:
I want to do two things here:

- Add SSH Keys
- Move "Preferences" into this panel

But this controller was pretty gigantic and messy. Split it apart and use
delegation instead.

There are no functional changes. I changed some of the conduit certificate text
to simplify it since no one should need to go through that workflow anymore,
given the existence of "arc install-certificate".

Test Plan:
- Edited realname, including attempting to remove it.
- Edited profile…