Tools: use script framework for deployment

Provide deployment scripts, the following tools had been quickly looked:

• https://deployer.org: maybe too light and too fresh
• http://rocketeer.autopergamene.eu: good balance between complexity and lightweight
• https://www.phing.info: maybe too heavy and the XML like syntax may not be friendly
• https://robo.li: made by Drupal and Drush people. Will require to write custom PHP tools but with OOP approach. And maybe it will allow to provide scripts as an external dependency to mutualise between projects.

Next step: evaluate https://robo.li properly

Avoid duplication between Makefile and gitlab-ci.yml