Typos on 17
Fixed the link to the previous article

The link should not go to the preprod
Merge branch 'migrate_to_sf2_3' of github.com:j0k3r/website into j0k3r-migrate_to_sf2_3

Conflicts:
	src/Afsy/Bundle/FrontBundle/Resources/views/Avent/day_2013_17.html.twig