adding d1 for cloudflare environments

examples/cloudflare-worker/src/index.ts

@@ -1,15 +1,5 @@
+/// <reference types="@cloudflare/workers-types" />
+
 import { serve } from "bknd/adapter/cloudflare";
 
-export default serve({
-   app: (args) => ({
-      connection: {
-         type: "libsql",
-         config: {
-            url: "http://localhost:8080"
-         }
-      }
-   }),
-   onBuilt: async (app) => {
-      app.modules.server.get("/custom", (c) => c.json({ hello: "world" }));
-   }
-});
+export default serve();