docs(website): update reference to ersatz package

Author: jsamr

apps/website/docs/implementing-features.mdx

@@ -149,7 +149,7 @@ Let's go back to our `HandleLinkPressFeature` and implement a simple test.
 ### Install Ersatz and Testing Library
 
 To test injected scripts, the best way is to use
-[`@formidable-webview/ersatz`](https://github.com/formidable-webview/ersatz).
+[`@formidable-webview/ersatz`](https://github.com/formidable-webview/ubiquitous/tree/master/packages/ersatz#readme).
 It will mock the WebView and run a Web environment in [jsdom](https://github.com/jsdom/jsdom).
 
 <InstallPackageSnippet