Modernize the Review UI extension documentation.

Review Request #5462 — Created Feb. 11, 2014 and submitted — Latest diff uploaded

Information

Review Board
master
4e5e13b...

Reviewers

Much of the Review UI documentation was old, based on what we had when
we wrote 1.7.

This updates it to make use of the static bundles and JavaScript
classes. It's now shown to be a lot simpler to build.

It still leaves out much of the Review UI functionality, like custom
templates or diffing, but it's at least less misleading.

Built the docs and read through them.