chore(docs): update contribution license in readme (#3650)

## Checklist

- [ ] Title matches [Winglang's style
guide](https://www.winglang.io/contributing/start-here/pull_requests#how-are-pull-request-titles-formatted)
- [ ] Description explains motivation and solution
- [ ] Tests added (always)
- [ ] Docs updated (only required for features)
- [ ] Added `pr/e2e-full` label if this feature requires end-to-end
testing

*By submitting this pull request, I confirm that my contribution is made
under the terms of the [Wing Cloud Contribution
License](https://github.com/winglang/wing/blob/main/CONTRIBUTION_LICENSE.md)*.

---------

Signed-off-by: monada-bot[bot] <[email protected]>
Co-authored-by: monada-bot[bot] <[email protected]>

README.md

@@ -143,7 +143,7 @@ We are incredibly grateful to our entire community for contributing bug fixes an
 ## License 📜
 
 Wing is licensed under the  [MIT License](./LICENSE.md).
-Contributions are made under our [contribution license](https://www.winglang.io/terms-and-policies/contribution-license.html).
+Contributions are made under our [contribution license](./CONTRIBUTION_LICENSE.md).
 
 Happy coding, and remember: the sky's the limit with Wing (yes, another pun)! 🌤️🚀
 

apps/wing/README.md

@@ -143,7 +143,7 @@ We are incredibly grateful to our entire community for contributing bug fixes an
 ## License 📜
 
 Wing is licensed under the  [MIT License](./LICENSE.md).
-Contributions are made under our [contribution license](https://www.winglang.io/terms-and-policies/contribution-license.html).
+Contributions are made under our [contribution license](./CONTRIBUTION_LICENSE.md).
 
 Happy coding, and remember: the sky's the limit with Wing (yes, another pun)! 🌤️🚀