added fully working astro example

examples/astro/src/pages/ssr.astro

@@ -0,0 +1,23 @@
+---
+import { Api } from "bknd";
+const api = new Api({
+   host: new URL(Astro.request.url).origin,
+   headers: Astro.request.headers
+});
+const { data } = await api.data.readMany("todos");
+const user = api.getUser();
+console.log("user", user);
+
+export const prerender = false;
+---
+
+<h1>SSR</h1>
+<h2>Data</h1>
+<pre>{JSON.stringify(data, null, 2)}</pre>
+
+<h2>User</h1>
+<pre>{JSON.stringify(user, null, 2)}</pre>
+
+<a href="/admin">Admin</a> -
+<a href="/ssr">SSR (with auth)</a> -
+<a href="/">Home (static)</a>