Update next integration tutorial

[juujisai]

Config for Node 18/20 +

const nextConfig = {
  experimental: {
    esmExternals: "loose",
  },
};

Dynamic import - add ssr: false

const TESelect = dynamic(
  () => import("tw-elements-react").then((res) => res.TESelect),
  {
    ssr: false,
  }
);