Add new Getting Started page

Modified content in start-en.hbs to match the new theme, 
Added page specific css in content/_base,scss
Modified colours in main/_base.scss and footer/_base.scss
Modified link colours in _variables.scss 
@pjackson28 I just fixed the heading order. As for the panel element, I retrieved the code from the WET website and changed the content. I also read somewhere that the section element shouldn't be used to style content, in this case, a div is necessary. Here's the reference that I'm talking about: http://html5doctor.com/the-section-element/