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
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