Update typeahead for new UI

Summary: Uses modern UI, newPage, etc. Changes table behavior to always scroll if too large for container, can't find anything this breaks, but be on the lookout.

Test Plan: Pull up help and view pages, search for some people and projects.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D15611