.env file is not available in Environment variables lessons

.env file is supposed to be editable in four lessons of [Advanced SvelteKit / Environment variables](https://svelte.dev/tutorial/kit/env-static-private) section of Tutorial. In fact this file is not presented in the file system of mentioned lessons at all.

<img width="1376" height="697" alt="Image" src="https://github.com/user-attachments/assets/67e853dc-1eb4-48ab-8816-bbc89c35a304" />