Remove www subdomain from https://ultralytics.com

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Update of contact URLs in the README file.

📊 Key Changes

• Updated the links in the business inquiries and professional support sections, removing the 'www' prefix from the URLs.

🎯 Purpose & Impact

• Purpose: To ensure that the links to the Ultralytics website are consistent and presumably to reflect a recent change in the preferred website URL format.
• Impact: Improves user experience by directing them to the correct website for business and support queries with a cleaner URL format. There's no direct impact on the functionality of the software, but keeps the documentation polished and accurate.