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 
This is a global change (affects every page across the board). If you need to create a special layout for your page then add a conditional that only applies this change to just your page. You can see examples of conditionals in the various include files. Using a conditional here would allow you to safely affect only the h1 elements of the pages you want to touch.