chore: update stackblitz

Author: kamilmysliwiec

index.html

@@ -293,7 +293,7 @@ <h4>Live preview</h4>
           your personal browser.
         </p>
         <iframe
-          src="https://stackblitz.com/edit/nestjs-typescript-starter-pcysqn?embed=1&file=src/app.controller.ts&hideNavigation=1"
+          src="https://stackblitz.com/edit/nestjs-typescript-starter-pcysqn?embed=1&file=src/app.service.ts&hideNavigation=1"
           style="
             width: 100%;
             height: 600px;