moved almost all deps to dev to speed up installs, updated nextjs docs

docs/integration/nextjs.mdx

@@ -34,13 +34,26 @@ For more information about the connection object, refer to the [Setup](/setup) g
 Create a file `[[...admin]].tsx` inside the `pages/admin` folder:
 ```tsx
 // pages/admin/[[...admin]].tsx
-import { adminPage, getServerSideProps } from "bknd/adapter/nextjs";
+import { withApi } from "bknd/adapter/nextjs";
+import dynamic from "next/dynamic";
 import "bknd/dist/styles.css";
 
-export { getServerSideProps };
-export default adminPage({
-   config: { basepath: "/admin" }
+const Admin = dynamic(() => import("bknd/ui").then((mod) => mod.Admin), {
+   ssr: false,
 });
+
+export const getServerSideProps = withApi(async (context) => {
+   return {
+      props: {
+         user: context.api.getUser(),
+      },
+   };
+});
+
+export default function AdminPage() {
+   if (typeof document === "undefined") return null;
+   return <Admin withProvider config={{ basepath: "/admin" }} />;
+}
 ```
 
 ## Example usage of the API in pages dir