Merge pull request #33 from jsilvestre/master

Fixed: typos (thank you Harlan)
Home page slight enhancements
Cleanup
Responsive fix
Responsive fix
Fix footer links
Add forgotten pictograms
Capitalize in CSS
change app store icon + change install button styles
fix git repo link (we moved from mycozycloud to cozy)
change install instruction link label
typo
change forum url + put file app first in main application list
change forum url in doc footer
fix misleading info telling that rasppi image is based on Cubian distro
add information about how to change Couch mounting point
change vagrant minimum version
add error page
Merge branch 'master' of github.com:mycozycloud/cozy-docs
Moving Errors directory