Change Help button Functionality

Change the Help button to a dropdown menu that contains a link to FAQs:
a page that is to be written later, and Request Help which provides the
previous action of the help button, launching a modal help window.

The help button/dropdown menu has also been made available when a user
is not logged in.

dltp-174#
dltp-170#

Button Alignment

Align dropdown for Help! to the right edge of the button so that it does
not overflow off the page. From DBH feedback.

 * Note: link on FAQ is to a page that does not exist yet and is to be created under a separate ticket.
 * Although the help modal is linked it currently does not work unless a user is logged in. This is also to be addressed in a separate ticket.