Reduce polling interval from 30s to 3s

See scaffold-eth#385

Author: carletex

packages/nextjs/scaffold.config.ts

@@ -17,7 +17,7 @@ const scaffoldConfig = {
 
   // The interval at which your front-end polls the RPC servers for new data
   // it has no effect if you only target the local network (default is 4000)
-  pollingInterval: 30000,
+  pollingInterval: 3000,
 
   // This is ours Alchemy's default API key.
   // You can get your own at https://dashboard.alchemyapi.io