docs: update CONTRIBUTING.md link (#13)

Author: nearlyforget

README.md

@@ -69,7 +69,7 @@ The generated code is automatically formatted using `ruff`.
 
 ## Contributing
 
-We welcome community contributions. See our [Contribution Guide](https://github.com/Universal-Commerce-Protocol/ucp/blob/main/CONTRIBUTING.md) for details.
+We welcome community contributions. See our [Contribution Guide](https://github.com/Universal-Commerce-Protocol/.github/blob/main/CONTRIBUTING.md) for details.
 
 ## License