Revert "Removes defunct Aliaza Arboles from the showcase"

This reverts commit 47da3682072d2bcd36f14fc287bd0bba3529196a.
Fixes Alianza Arboles and adds My MS Community
Adds Doenersnet, Career College Lounge, and Pleio to the showcase
Adds rotaractivity, justairborne, milkers, and myfreepersonals. Also a 'Visit site' button for each listing