Add new output formatting system with flags for color and emoji control:
- Introduce OutputConfig and Writer structs for flexible output handling
- Add --colors and --emoji/--no-emoji global flags
- Refactor commands to use new Writer for consistent formatting
- Separate error content from presentation for better flexibility
Implement bootstrap functionality for streamlined dotfiles setup:
- Add 'bootstrap' command to run setup scripts manually
- Auto-execute bootstrap on 'init' with remote (--no-bootstrap to skip)
- Update README with bootstrap usage and examples
- Extend tests to cover bootstrap scenarios
