Add a test framework to test the JS part of the course #2471
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This is a first draft for a test framework for testing the JS part of the book that is discussed in #2462
It is using webdriverIO and the webdriverIO Expect API in combination with Mocha. WebdriverIO is taking care of accessing the webpage with a real browser and can access the state of the page so behavior can be asserted.
Currently only a small test for the speaker-notes implementation demos the functionality.
The Static Server Service is used to serve the book in a way that the test runner can access it.
A CI integration can look like https://webdriver.io/docs/githubactions/