Change port to 8081 + some minor tweaks

Author: niyoko

index.html

@@ -8,7 +8,7 @@
     <div id="react-root"></div>
 
     <script>
-      const bundlePath = 'http://localhost:8080/build/bundle.js';
+      const bundlePath = 'http://localhost:8081/build/bundle.js';
       const bundleScriptEl = document.createElement('script');
       bundleScriptEl.src = bundlePath;
       document.currentScript.parentNode.insertBefore(bundleScriptEl, document.currentScript);