Revert "Allow search results to be snippeted, roughly"

Summary:
This reverts commit 15837388428d6dd3c37cf4b1d302e78657fce24e.

See T8646 for discussion. This version of the feature feels terrible on real data.

Test Plan: Strict revert.

Reviewers: chad

Reviewed By: chad

Differential Revision: https://secure.phabricator.com/D14097