New layout

I changed the (CSS) layout a bit.

The main changes are:
- Mobile first responsiveness (pretty basic right now)
- The comments were changed to a sans-serif font
- The front page now uses a two-colum grid and is centered
- The top bar is using a black background and white font and dimensions were changed a little

Screenshots:

The front page:
http://cl.ly/BDGc

The front page resized (look at how the two column grid turns into one column):
http://cl.ly/BE0E

The comments page:
http://cl.ly/BD6l

Currently the CSS is totally screwed up (it seems to be very hard to maintain), so I plan to restart the layout and CSS from zero (if you guys agree with a redesign), although keeping LN's minimal design.

Also, I propose some markup changes: it seems LN is currently using some elements that don't even exist in the HTML5 spec, like ``, ``, `` etc.
I'd be happy to help you change that to a more semantic markup, the only problem is that I don't know how to use the tool LN uses to generate the markup.