Enhancement: root cwd at a git repo

### Describe the feature you'd like
Like starship.rs and other tools like ripgrep or fzf, whenever you are in a git repo the tools will "root" you into the root of the project directory. Given that I am often working within git repos, I would like for the cwd to be shortened to "root" the position into the root of a git repo.

### Describe risks you've considered
This is a breaking change and would change the default behaviour for people, so putting it behind a feature flag would be good.

Example behaviour/inspo. here: https://github.com/airblade/vim-rooter