fix: Remove .nixpacks and .docker folders

- Delete auto-generated .nixpacks folder
- Delete .docker folder
- Easypanel should use root Dockerfile only
- This prevents confusion with multiple Dockerfile locations

dealplustech-astro/dist/_noop-middleware.mjs

@@ -0,0 +1,3 @@
+const onRequest = (_, next) => next();
+
+export { onRequest };