#24 (With some small adjustments)

- I keep the .project .illustrate with double of the size you suggest;
- Some margins/paddings are larger than you suggest too;
- Until now I don’t change any text-size. I would like if you take a
look in this result and in pair-programing we can work on this size
adjustments @mpontas ;
Just naming sections in screen768.scss like it is named in structure.scss
Prevent not centered .intro