feat: update networks config

[kyscott18]

import { createConfig } from "ponder";
import { mainnet, optimism } from "viem/chains";

export default createConfig({
  chains: [mainnet, optimism],
  rpcUrls: {
    [mainnet.id]: string | string[]
    [optimism.id]: string | string[]
  }, 
  // ... more config
});

Related

#1291 #1290