Fix link to the website docs (#779)

CONTRIBUTING.md

@@ -19,6 +19,6 @@ Before we can merge your changes, you must agree to the [Uber Contributor Licens
 
 In addition to making pull requests and Github issues on the @uber/h3 repository, there are other ways you can contribute. Here are some suggestions:
 
-* Writing and updating the [documentation website](./docs/).
+* Writing and updating the [documentation website](./website/docs/).
 * Writing [bindings](./dev-docs/creating_bindings.md) for your preferred language.
 * Writing components so that your preferred GIS, mapping, or visualization system can display H3 indexes.