Bobcat 2.0: documentation refresh

[mkrzyzanowski]

It's time to properly handle the documentation :). This is a summary ticket for all tasks related to the docs update.

• [ ] migrate whatever is worth and still true from the wiki to our docs site
• [x] document the new functionality related to interfaces handling
• [ ] document the setup with various cloud providers, e.g. SauceLabs, Crossbrowsertesting, etc. (#69)
• [ ] running tests in parallel (#218)
• [ ] document how to run tests on CI servers, e.g. Jenkins, Bamboo, etc. (#258)
• [x] review the existing codebase regarding and update or add JavaDocs on the whole public API

[mkrzyzanowski]

JavaDocs:

• [x] Junit 5
• [x] bb-aem-core
• [x] bb-aem64
• [x] bb-core