Summary:
Ref T2625. Also modernize some other things:
- Fix double-"subscribers".
- Use byline and more standard date.
- Modernize some of the use of crumbs and navigation.
- Delete some dead / uncalled code.
Test Plan: {F50669}
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T3578, T2625
Differential Revision: https://secure.phabricator.com/D6486
