Default to `current/` folder

[benjie]

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

[benjie]

Hat tip to @dmfay for the idea.