Michael Czechowski 1b9b2f315a add slide content improvements and dev server setup ...

223015b:
- add WTF hex code explanation slide (89=137 decimal, PNG signature)
- add ASCII lead slide with historical context
- remove Hilbert-Studie reference from title

223015c termin 2:
- add OSI layer 5 (session) and layer 6 (presentation) slides
- add URL/domain anatomy slide
- mark HTTP/S section as klausur
- improve status codes formatting with client/server examples
- add CRUD column to HTTP methods table

infrastructure:
- add dev-server.sh for multi-course development
- update generate-index.sh with course-specific colors
- add QR codes for slide URLs

2025-12-30 16:24:44 +01:00

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