- Reduce welcome module from 3 lessons to 1 concise intro
- Reduce goodbye module from 3 lessons to 1 concise outro
- Create standalone playground module at end of module list
- Update all translated welcome files (de, pl, es, ar, uk)
- Playground now appears after goodbye, less prominent
🤖 Generated with [Claude Code](https://claude.com/claude-code)
- Hello World lesson now styles plain text (no h1 required)
- Added syntax examples to CSS Variables, calc(), Media Queries, Flexbox, Grid
- Added goodbye/offboarding module with contribution encouragement