- resize all images to max 1920px width (152MB → 66MB)
- add assets-original/ to gitignore for backups
- add make optimize-images target
- add make deploy-html for faster HTML-only deployment
- fix course number 223015c → 223015b in termin 1
- adjust language: "fuck" → "heck" in example
- add black backgrounds for image-only slides
- add bg fit to fullscreen images
- update digital-landscape.png
- add frontmatter to termin 2-4 slides