Update README.md with Discord badge

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced README with social links and restructured layout for better accessibility.

📊 Key Changes

• Added Discord community link and badge to the README.
• Reorganized introductory content and GitHub Actions badge for a clearer and more engaging first impression.

🎯 Purpose & Impact

• Boost Community Engagement: By including a Discord link, the project aims to foster a more interactive and supportive community where users and developers can discuss, share feedback, and seek help.
• Improved Accessibility: The restructuring of the README ensures that new visitors can quickly understand the project’s scope and access key resources, potentially increasing user engagement and project visibility.
• Visual and Social Enhancements: The addition of badges and links directly at the beginning of the README makes it easier for users to take action, like joining the community or understanding the repository's health at a glance.

🚀 These changes aim to make the project more welcoming and accessible to both new users and seasoned developers, enhancing the project's community and usability.