fix: remove unneeded import

Author: Rel1cx

apps/website/content/docs/contributing.mdx

@@ -2,8 +2,6 @@
 title: Contributing
 ---
 
-import diagram from "../../assets/monorepo_diagram.png"
-
 Contributions are welcome!
 
 Please follow our [contributing guidelines](https://github.com/Rel1cx/eslint-react/blob/main/.github/CONTRIBUTING.md).