3275, 3276, 3371 spruce up home page, tweets for maintenance

We wanted to do a number of things to make the main page prettier and more useful: put the module back on the side, add a twitter feed, correct the intro text, link to the OTW site. In another issue, we also wanted to add @AO3_Status tweets to the maintenance page, which was easy enough to do by just calling the same JS as we use for the main page

http://code.google.com/p/otwarchive/issues/detail?id=3275
http://code.google.com/p/otwarchive/issues/detail?id=3276
http://code.google.com/p/otwarchive/issues/detail?id=3371