Refactor the Phortune account detail page into a series of smaller, more focused sections

Summary:
Ref T13366. Some of the information architecture is a little muddy here, notably an item called "Billing / History" which contains payment methods.

Split things up a bit to prepare for adding support for "Email Addresses".

Test Plan: {F6676988}

Maniphest Tasks: T13366

Differential Revision: https://secure.phabricator.com/D20697