R1:99292c5c6a67

Use icons with Config Options page

Summary: This sets an icon for each config, makes it easier to scan.

Test Plan:
Reload Config page, see all new icons

{F281089}

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11619