Projektdateien archivieren

Please analyze the ~/Projects/old-website project:
- Total file size
- Largest files and folders
- Temporary files that can be safely deleted (node_modules, .cache, build, etc.)
- Estimate how much space can be saved after cleanup

Then clean up temporary files:
- Delete node_modules, .next, dist, build folders
- Delete .DS_Store, Thumbs.db and other system files
- Delete .log and .cache files
- Keep package.json, README.md and other important files

Finally, package the project:
- Use tar.gz format for compression
- Include date in filename: old-website-archive-20250112.tar.gz
- Save to ~/Archives folder
- Verify archive integrity