docs: remove contributing link (conventional-changelog#146)

Author: DanielRuf

README.md

@@ -65,7 +65,7 @@ Thank you to all our backers! 🙏 [[Become a backer](https://opencollective.com
 
 ## Contributors
 
-This project exists thanks to all the people who contribute. [[Contribute](CONTRIBUTING.md)].
+This project exists thanks to all the people who contribute.
 
 [![contrubitors](https://opencollective.com/verdaccio/contributors.svg?width=890&button=true)](../../graphs/contributors)