Convert phutil_render_tag(X, Y, '...') to phutil_tag

Summary:
Created with spatch:

- phutil_render_tag
+ phutil_tag
  (X, Y, '...')

Then searched for & and < in the output and replaced them.

Test Plan: Loaded homepage.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4503