R1:718c39131da8

Add a little style to Phriction ToC menu

Summary: Adds some indentation and color. Ref T9868.

Test Plan: A long page with multiple indentation levels.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T9868

Differential Revision: https://secure.phabricator.com/D18025