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 
@burgvan You can still use a list, nested the details in each <code>li</code> and even using the <code>row</code> class on the <code>li</code>. Alternatively you can turn it into sections with headings. The problem with the current approach is it is lacking structure which is why I suggested using a list (but section + headings would work as well).