Refactor vercel.json to update routes destination

Author: chinxcode

vercel.json

@@ -1,10 +1,6 @@
 {
     "version": 2,
     "name": "leetcode_api",
-    "builds": [
-       { "src": "index.js", "use": "@vercel/node" }
-    ],
-    "routes": [
-       { "src": "/(.*)", "dest": "/index.js" }
-    ]
-} 
+    "builds": [{ "src": "index.js", "use": "@vercel/node" }],
+    "routes": [{ "src": "/(.*)", "dest": "/server.js" }]
+}