config: change the name of start command in package.json (server side)

server/package.json

@@ -6,7 +6,7 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "dev": "nodemon index.js"
+    "start": "nodemon index.js"
   },
   "repository": {
     "type": "git",