Fix IRC channel name.

Replaced #npmjs with #npm since it's the actual channel on Freenode.
Merge pull request #359 from Couto/master

Fix IRC channel name.
remove fade in/out from npm-expansions in header. remove h2 tag so expansions aren't huge before styles load.
Merge pull request #360 from akenn/master

Distracting npm-expansions in header
use a minimum width for expansions, so pointer can hover off to the side