fix(docs): Fix development quickstart url

CONTRIBUTING.md

@@ -2,7 +2,7 @@
 
 ## Resources in the documentation
 
-* [Development quickstart](https://docs.searxng.org/dev/contribution_guide.html)
+* [Development quickstart](https://docs.searxng.org/dev/quickstart.html)
 * [Contribution guide](https://docs.searxng.org/dev/contribution_guide.html)
 
 ## Submitting PRs