R1:3f46d30e8f92

Replace home directory list with a dashboard

Summary:
Rough cut that still needs a lot of polish, but replace the directory list with
more of a dashboard type thing:

- Show "Unbreak Now", triage-in-your-projects, and other stuff that you're
supposed to deal with, then feed.
- Move tools a click a way behind nav -- this also lets us put more stuff
there and subtools, etc., later.
- Remove tabs.
- Merge the category/item editing views.
- I also added a light blue wash to the side nav, not sure if…