Pages improved

Hey Eddie,

I updated pages.html. 

I also had to change a few styles, you should have a look at the merge. 

Most important additions:
- the main column needs to be wider for pages than for agenda etc.
- I added the Foundation side-nav styles and am using their html for that for the sidenav. I tweaked the styles to match the design.

We had that Vegas bug with the background image. I created a new plugin to solve that (Gatefold) and that's in now.