Delete rebase.yml

[glenn-jocher]

No longer required with new built-in GitHub PR merge master feature

Signed-off-by: Glenn Jocher glenn.jocher@ultralytics.com

TODO:

• Update PR message and contribute.md with new merge instructions.

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Streamlining contribution workflow with updated GitHub Actions and contributions documentation.

📊 Key Changes

• Removed detailed git command instructions from greetings.yml, simplifying the initial message to new PR submitters.
• Deleted the rebase.yml GitHub Action which automated rebasing of PRs.
• Updated CONTRIBUTING.md to guide contributors towards using the 'Update branch' button or local git commands for branch updates rather than the removed rebase option.

🎯 Purpose & Impact

• Enhances clarity for new contributors by simplifying the welcome message for PRs.
• Encourages manual updating of contributors' branches which may lead to a better understanding of the merge process.
• Potential impact includes contributors needing to adapt to a change in the workflow, potentially improving their git skills. However, it could increase the learning curve for new contributors.