Overview and staff pages tweaked

In the "Overview" page in "About the Archive," I added a mention of our most recent grant from NHPRC (2013-2014).  I also added Literary Studies in the Digital Age to my description on the "staff" page.
                    --Ken

Front page and Support page altered in light of new NHPRC grant

As per Ken's request, I've added a credit to NHPRC as a funder on the site's opening page and on the Support page. On the support page, I've also made the slight revisions to the text that Ken asked for. Because the NHPRC logo's text was unreadable at the size of the other logos (80px wide) and because IMLS has a new text-based logo that is even more illegible at that size, I've updated all of the logos to 130px wide.

— Brett