Group functionality improved, links now connect all group functions with...

...in group views. Main group index can now be accessed from navbar.

app>views>groups>index.html.erb
   -added link to create new group
   -changed group name display to header2 style
   -added link to group name that links to show page

app>views>groups>edit.html.erb
   -changed "back" link to a header4 style

app>views>groups>show.html.erb
   -added display for group description
   -added display for group website
   -changed "edit" link to a header4 style
   -added a "back" link that links to groups index

app>views>groups>new.html.erb
   -changed "back link to a header4 style
   -changed "back" link so it now links to groups index

app>views>layouts>application.html.erb
   -added a "users" tab that links to main index