Change width of main area#220

Adding the option to give the main area more width.

Thanks, Michael. The main area has a width of 690px currently. How wide would you make it, and why?

On websites with a minimal design (like nolt.io which looks great btw) getting to the feature subdomain it appears to break the UI/UX flow, as the user has to get used to something completely different. (Wide -> Narrow)