Remove the default fuschia color on code blocks

With the LESS/Bootstrap upgrade, `<code>` blocks are now colored fuschia by default: 

![fuschia](http://f.cl.ly/items/0A0U0B3V2U3i2O3w391v/Screen%20Shot%202013-06-04%20at%2012.48.35%20PM.png "fuschia")

That's weird. They should probably be black by default.

CC @larz0