Contrast improvement

http://www.youtube.com/watch?v=fPVUa29kHu8

Primary reason for this: I was running user CSS to make the fuzzy pale grey text readable. As in, I really had trouble reading it and was actively avoiding looking at the website. The code examples are still nasty to read but I haven't worked out a better colour for those yet.

Secondary reason: IMHO the mozart logo looks Shit Hot(tm) on charcoal, the white and yellow pop beautifully. Also this colour scheme seems popular with those I've shown, more than the salmon anyway.

![image](https://f.cloud.github.com/assets/4961726/1170070/9ef417f2-20c6-11e3-8487-b30ca2a2838e.png)