- add svg diagonal stripe patterns for pdf background
- use @media print to apply svg only in pdf export
- keep css gradient for web/screen display
- add _header: '' and _footer: '' to all klausur slides
- 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
223015b:
- add klausur styles to termin-3, 4, 5
- consistent styles across all 6 termine
223015c:
- h1: darker raspberry (#a02060)
- h2: dark gray almost black (#1f2937)
- section.invert h1: white
- consistent styles across all 3 termine
also:
- add squoosh link and QR code
- update video title to "RIIIIIIIESIG"
- replace i-frame diagram with canon image
- add lead slide "Kompression"
- rename to "Verlustfrei vs. Verlustbehaftet"
- rename to "Verlustfrei: Lauflängenkodierung (RLE)"
- merge duplicate lossy slides into "Verlustbehaftet: Der Trick"
- add hexed.it QR code and link
