Add a rough Quick Search datasource for Phriction documents
Also supports w to jump to Phriction and w query to query Phriction.
The actual query logic for the datasource may need some tweaking after it collides with reality, but seems to produce fairly reasonable results in local testing against synthetic data.
Test Plan: Searched for "Porcupine Facts", "Travel Companions", and other useful local pages. Searched for w. Searched for w zebra facts.
Differential Revision: https://secure.phabricator.com/D19107