fix help modal to streamline user path and reduce help tickets

@stvstnfrd - Help Modal changes (has corresponding theme changes here: https://github.com/Stanford-Online/stanford-theme/pull/6)
This `.help-buttons` class looks like it would be better served by
switching it to from a `<DIV>` to a `<UL>`. This should also allow us to
remove those ugly `<BR/>`s below ;)