R1:b5c9c64b0f2e

Convert Guides to Modules

Summary: Splitting these up to re-use in Config as a stop gap.

Test Plan: Visit welcome, install, and quick start on guides app

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D16478