add diagonal stripes to klausur slides and update content

- add diagonal stripe pattern to klausur class
- add aufgabe class for exercise slides
- update napster section with new images
- revise hands-on audio exercise with online tools
- various content improvements
This commit is contained in:
2026-01-05 17:13:26 +01:00
parent 3f4be26dcb
commit 8690e69e47
3 changed files with 30 additions and 19 deletions

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