Go back to using regular links for homepage action buttons.

When launching our three buttons for each homepage (try, host, support) we wanted accurate google analytics,
so a change was made to post GA events for each button press, and we'd wait for the report to complete before
doing the action.  It turns out that we've used Optimizely more than GA for analysing behavious on these pages, and this technique has the added risk that people with GA blocked might not have had button presses work.  This reverts back to the previous approach of using regular <a> links as much as possible for those buttons.