npm start script updated

package.json

@@ -5,7 +5,7 @@
   "description": "",
   "main": "src/bin/www.js",
   "scripts": {
-    "start": "NODE_ENV=production node src/index.js",
+    "start": "NODE_ENV=production node src/server.js",
     "dev": "node src/server.js",
     "next": "next",
     "build": "next build",