Fix vercel runtime specifications - 2

Author: taha-kahya

vercel.json

@@ -2,10 +2,5 @@
   "framework": "nextjs",
   "buildCommand": "npm run build",
   "outputDirectory": ".next",
-  "installCommand": "npm install",
-  "functions": {
-    "pages/api/**/*.js": {
-      "runtime": "@vercel/node@3.0.7"
-    }
-  }
+  "installCommand": "npm install"
 }