Renamed all lesson files with clear numbered prefixes:
Before:
- checklist.md
- lesson.md
After:
- 01-quick-checklist.md
- 02-full-lesson.md
Benefits:
- Clear ordering in file browser
- Easy to see which is quick vs full
- Professional file naming
- Better for navigation
- Consistent across all 4 lessons
Updated module overview with new filenames.
Mårten Angner