Update Phame documentation to reflect changes to the application
Summary:
Ref T9360. Old docs felt a little weird to me (particularly very-old text like "favoring the individual rather than the collective").
Try a simpler tone focused more on use cases and examples?
Test Plan:
Read documentation.
Also, viewed a post list and saw monograms.
Reviewers: chad
Reviewed By: chad
Differential Revision: https://secure.phabricator.com/D16246