Dispose: delete pre-created folders when the template does not exist

### Describe the feature

When trying to `giget` a template that doesn't exist, 

```bash
$ giget gh:unjs/empty
```
the folder ends up being created:
```bash
|- unjs-empty
```

Should we make the behavior of `giget` and `git` consistent, Clear the pre-created folder when the template doesn't exist ?

### Additional information

- [X] Would you be willing to help implement this feature?