- Create folder from the synced folders instead of shell provision scripts.
- Use the zip file provided on the main site, which contains all dist-* plugins.
- Use custom virtual host instead of apache2 default.

Reviewed-on: https://git.spip.net/arkhi/spip-testing/pulls/2

Merge pull request 'Ajout du provisioner `upgrade-os` dans le README.' (#3) from develop into master

Reviewed-on: https://git.spip.net/arkhi/spip-testing/pulls/3