Reame.md example deprecated

The readme.md page shows that mimalPreset is to be used

```js
import { minimalPreset preset } from '@vite-pwa/assets-generator/config';
```
However, this has a strike through it as deprecated and says to use `{ minimal-2023 as preset }` instead.

https://github.com/vite-pwa/assets-generator?tab=readme-ov-file#-usage