Trackerstatus

Fixed
- Fixed PTPEndpoint to use correct subdomain-based URL format
- Updated PTPEndpoint to use base class's endpoint construction methods

Fixed
- Fixed critical bug where tracker-specific endpoints were using incorrect URL format
- Changed from `https://trackerstatus.info/api/btn/all` to `https://btn.trackerstatus.info/api/all`
- Updated all tracker endpoints to use subdomain-based URLs
- Fixed URL construction in APIClient and BaseTrackerEndpoint
- Fixed black formatting in status.py

Changed
- Simplified Quick Start example in README.md to focus on essential functionality
- Improved code readability in examples