Infrastructure : Integrate cypress.io as e2e testing framework

Trigger a default cypress integration tests checking the interface:

• For now trigger the test execution on each push on every branch
• Prior to the test execution we need to build the app with config file being the copy of config.sample.json (including external api endpoints on https://api.coopstarter.happy-dev.fr)
• First thing check if you can see the sentence "Welcome to our international index of resources for cooperative mentors and entrepreneurs" from the home page
• Then if it works, try to check for the title of a resource in the "Access without registration" space

Ok for you ? Is that clear ?