Remove last year's dais photos

It would have been easier if I had done this before adding this year's
photos
Replace UNTC graphic with my own version

Doesn't mess up the layout on the committee list page and generally
looks better imo
Replace The Great Empire graphic with my own

Same as before. Map source:
http://commons.wikimedia.org/wiki/File:Roman_Empire_map.svg, with the
colours modified. Font: Cinzel.
Resize dais photos that are unexplicably huge