msui: Improve Tutorials

Project description: Improve the existing tutorial scripts. Merge Text / Audio with movies. Make the tutorials creatable in background without a screen, e.g. xvfb-run on a docker setup Create a bunch short new tutorials. Add new tutorial scripts and potentially integrate the tutorials into the test suite, as a sort of integration test.
Duration: 90h - 350h
Skills: Python, Qt, Git, AI-Assistant
Difficulty level: Medium
Related Readings/Links:
- https://mss.readthedocs.io/en/stable/tutorials.html
Potential mentors: rb.proj@gmail.com, m.risse@fz-juelich.de