feat: add vercel configuration for Next.js deployment

Author: Marvin Zhang

vercel.json packages/web/vercel.jsonvercel.json renamed to packages/web/vercel.json

@@ -2,8 +2,7 @@
   "framework": "nextjs",
   "buildCommand": "pnpm build",
   "installCommand": "pnpm install --frozen-lockfile",
-  "rootDirectory": "packages/web",
   "env": {
     "NODE_ENV": "production"
   }
-}
+}