R1:5f02ed5bbb7d

Phame - add some application polish.

Summary:
Fixes T4880. More specifically

- adds an "edit" pencil to post lists iff you can edit the post
- style change so this has no text-decoration
- adds a "no data" box if you have no posts in a given view
- style change to crush some margins so it formats like posts do
- adds some validation that your configuration is correct if you are specifying a custom domain
- updates docs about custom domains

Test Plan: clicked around and it was better! (see…