improved astro adapter (serving api) + added documentation

examples/astro/src/pages/api/[...api].ts

@@ -1,21 +1,12 @@
-import type { APIRoute } from "astro";
-import { App } from "bknd";
+import { serve } from "bknd/adapter/astro";
 
 export const prerender = false;
 
-let app: App;
-export const ALL: APIRoute = async ({ request }) => {
-   if (!app) {
-      app = App.create({
-         connection: {
-            type: "libsql",
-            config: {
-               url: "http://127.0.0.1:8080"
-            }
-         }
-      });
-
-      await app.build();
+export const ALL = serve({
+   connection: {
+      type: "libsql",
+      config: {
+         url: "http://127.0.0.1:8080"
+      }
    }
-   return app.fetch(request);
-};
+});