Merge profile "About" into main profile and simplify some custom field stuff
Summary:
Ref T1703. Drive "user since" with a custom field and make the other fields render into a property list.
Users can make their profiles a little more personal/obnoxious now.
Also delete a bunch of code.
Test Plan: {F49415}
Reviewers: chad, btrahan
Reviewed By: chad
CC: aran
Maniphest Tasks: T1703
Differential Revision: https://secure.phabricator.com/D6401