Vertical Rhythm (wip)

Les règles pour petit écran sont probablement foireuse du coup.

- [x] rythme vertical de base
- [ ] ajustement page manifesto
- [ ] ajustement page posts
- [ ] ajustement 404
- [ ] ajustement petits écrans
fixed <code> line-breaks
Better vertical rhythm for posts list
README: SVG Badges
Bigger header
Remove post title useless font-family
Adjust space for crew list
vertical rhythm on posts
Adjustment for small screen (after vertical rhythm added)
Fix tags filters for small screen
Disable visual vertical grid
Merge pull request #142 from putaindecode/vertical-rhythm

Vertical Rhythm