Reorg nav

With the new addition of the 'members' section, the navbar was starting to get a bit cluttered.

d24a390 pulls out the facebook and google groups into a uified contact page.

36ff80d adds extra information about our chapter in the 'what-is-acm' page, including a link to the member list, adn removes the direct link to the member list
ERMAHGERD WHITE-SPERCE.