Ticket #979 - Change Group creation page markup per design

Exposing "Site Details" sub header on group creation page, step 1, for
project and club creation (it is already showing on courses)
Ticket #979 - Change Group creation page markup per design

Adjusting markup on Group creation page, step 1, to match design and
provide some extra classes for easier styling
Ticket #Change Group creation page markup per design

Styling updates related to markup changes for Group creation page, step 1.