Address some feedback comments: notifications, test. And rename section
This includes some comments from OC-3352.
Testing
- check the diff. HTML shouldn't be broken
- Create .tar.gz and import it into Studio, into a course with the following data: course:„onboarding“, org:„OpenCraft“, run:„course“
- follow the course. Check that there's a new section about notifications, and that the section „configuring your opencraft e-mail“ was renamed to a longer name
- check that the internal link added in „first technical task“ to „code quality“ works
- check the content, it must address:
- types of tests, how to run each, some are slow
- handle notification overflow; synchronous/asynchronous and times
- over-commiting; how to take tasks progressively during the week
- communication about non-task related work
- and in addition, the issues requested as part of the review in github