Complete RTD token requirements solution

- Add comprehensive documentation explaining RTD doesn't need GitHub tokens
- Document three strategies: token-free (recommended), with-token, and hybrid
- Improve script logging to clarify when tokens are needed vs optional
- Explain public releases vs private artifacts authentication model
- Provide clear guidance for RTD setup without authentication complexity

Key improvements:
- RTD works without tokens using releases + local fallback
- Clear messaging about what requires authentication
- Graceful degradation when tokens are unavailable
- Optimal strategy recommendations for different use cases

Author: selimfirat