Hide page actions on main page

Right now they don't look well in tablet mode since h1 is empty when the
user is not logged in.

Hide them using CSS so that we can easily change this back without
waiting for cache to update.

Change-Id: I6fb710dedd3473ad7f9fbe00b202ef4825e646ba
(cherry picked from commit 35da442dea826cb126dc871fb9d1d9ebfeda5899)