fixing imports and ssr support + updated remix/nextjs/astro examples

examples/nextjs/src/pages/admin/[[...admin]].tsx

@@ -1,9 +1,20 @@
-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" }} />;
+}