add article 15 + typo in 10
add day 14
Merge pull request #56 from alexandresalome/day-15

Article du 15 (+ typos dans le 10)
Switch @matt2cant avatar to black'n'white
Fix some code block problem
Fix day 14

- add missing images
- update bio according to gdoc
- fix some code block
Merge pull request #57 from j0k3r/migrate_to_sf2_3

Fix day 14 & 15
Ajout article 16
Article 16 - fix typos
fix typo
Merge pull request #58 from tyx/migrate_to_sf2_3

fix typo
Jour 17
Logo Vagrant plus petit
Repair config file inconsistencies in preprod env
Correction de l'erreur d'avatar et rajout de l'extract
Correction des images
Corrections après relecture en preprod 1
Modifications après relecture en preprod 2
Corrections après relecture en preprod 3
Small corrections in deployment Fabfile