Add !important to RES CSS rule

It gets overwritten by RES otherwise
Limit scope of dark-blue link color (Fixes #2)

The dark-blue CWRU link color was applying to the whole page, making
links in the comments indistinguishable from the black text in the rest
of the comment. This should limit the dark blue links to the #header
area and use reddit's default coloring for links in the comments.