Fix Conpherence CSS (mostly revert)

Summary: Fixes D7669

Test Plan: test many participants and many threads in Conpherence, mobile and desktop.

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7696
Fix wrong link to "Create Rule" in Herald mobile view

Summary: The link pointed to `create/`, which gives as `404`.

Test Plan: clicked the link. It worked.

Reviewers: epriestley, #blessed_reviewers, chad

Reviewed By: chad

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7698