[EPIC] Refactor Dusk Fixtures test into Cypress

[troccoli]

The Tests\Browser\CRUD\FixturesTest test takes far too long, more than 15 minutes. This is unacceptable. Besides, many times it fails because the SPA is taking too long.

The current Dusk test uses a lot of pause(1000) statements throughout to try and let the application catch up with the test. Many times this is not enough and the test fails.

By refactoring this test in Cypress we accomplish two things: we show how testing can be done in Cypress too, and we don't need to programmatically pause our test in order to wait for the page, as Cypress does this automatically (up to 5 seconds).

• Allow Cypress tests to be run locally #115
• Setup GitHub Actions to run Cypress tests #116
• Setup CircleCI to run Cypress tests #117
• Setup TravisCI to run Cypress tests #118
• Move FixturesTest from Dusk to Cypress #119