should `nimbledeps` by default be ignored by git
When `nimble setup -l` is used it appends the following to `.gitignore`:

```txt
nimble.develop
nimble.paths
```

It would be useful whenever `nimble` also first creates `nimbledeps/` to ignore it by writing `/*` to `nimbledeps/.gitignore`. 

Of course folks could do this manually or add `nimbledeps/` to `.gitignore`, but this seems like it could be a good QOL default, especially since it is an exceptional situation that one maintains `nimbledeps/` under version control.