added font and colours

Using the Gotham font for web isn’t a possibility at this time (would
cost $99 http://www.typography.com/fonts/gotham/styles/screensmart/) so
have used a Google font equivalent. Seems to be just as good too so may
stick with this.
Also added some variables to the Less file for colours and a font
stack. Am loving Less.
Lastly, I guttered the CSS code that was there as I didn’t need most of
the base template.