updated App options "seed", changed examples to file db

examples/bun/index.ts

@@ -7,7 +7,7 @@ import { type BunBkndConfig, serve } from "bknd/adapter/bun";
 // this is optional, if omitted, it uses an in-memory database
 const config: BunBkndConfig = {
    connection: {
-      url: ":memory:"
+      url: "file:data.db"
    }
 };