Trying to fix deployment to Heroku 6: Changing the start script to serve build

messages-app-frontend/package.json

@@ -24,11 +24,11 @@
     "npm": "9.5.0"
   },
   "scripts": {
-    "start": "react-scripts start",
+    "devStart": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
     "eject": "react-scripts eject",
-    "heroku": "serve build"
+    "start": "serve build"
   },
   "eslintConfig": {
     "extends": [