Default to `current/` folder

### Feature description

New users don't know that this is an option. Since it's the preferred option, we should make it the default when users `init`.

### Motivating example

It's fairly intuitive that you can just add more files to the `current/` folder, and symlinking referenced files into it is much easier if you have this pattern in place already.

### Breaking changes

None.

### Supporting development

I [tick all that apply]:

- [x] am the maintainer