Fix redirected URLs

[glenn-jocher]

Summary

• update redirected external URLs to their final destinations
• apply the redirect cleanup across tracked documentation and related text files

Testing

• no tests run (link-only changes)

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

🛠️ This PR makes small but important README link fixes to improve documentation accuracy and link reliability.

📊 Key Changes

• Updated the AGPL-3.0 license link in README.md from an incorrect Open Source Initiative URL to the correct agpl-3.0 page 🔗
• Updated the YouTube link to use the full www.youtube.com URL instead of the shorter youtube.com format ▶️
• No code, APIs, or template functionality were changed; this is a documentation-only cleanup 🧹

🎯 Purpose & Impact

• Improves documentation correctness, so users are directed to the right license information ✅
• Makes external links more consistent and reliable across browsers and platforms 🌐
• Reduces confusion for users reviewing licensing terms or visiting Ultralytics social channels 🙌
• Low-risk change with no effect on runtime behavior, installs, or project features 🔒

[UltralyticsAssistant]

👋 Hello @glenn-jocher, thank you for submitting a ultralytics/template 🚀 PR! This is an automated message to help with a smooth review process—an engineer will assist you shortly 😊

• ✅ Define a Purpose: Clearly explain the purpose of your fix or feature in your PR description, and link to any relevant issues. Ensure your commit messages are clear, concise, and adhere to the project's conventions.
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• ✅ Update Documentation: Update the relevant documentation for any new or modified features.
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[UltralyticsAssistant]

🔍 PR Review

_{Made with ❤️ by Ultralytics Actions}

Clean documentation-only change. Both URL updates are narrowly scoped, align with the stated intent of reducing redirects, and I don't see any correctness or maintainability issues in this diff.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[UltralyticsAssistant]

🎉 Merged — thank you, @glenn-jocher!

As Leonardo da Vinci said, “Details make perfection, and perfection is not a detail.” This PR is a great example of that mindset in action: small README link fixes, but a meaningful improvement for documentation accuracy, consistency, and user trust.

Really appreciate you taking the time to polish these details and make the project just a little better for everyone. Contributions like this help keep the Ultralytics ecosystem clear, reliable, and welcoming. 🙌