Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

Migrate from `pijul::current_dir` to `std::env::current_dir`

The function pijul::current_dir was just a wrapper around std::env::current_dir, so this should make things a bit more readable and remove circular dependency between pijul and pijul::repository.

Created by  finchie  on July 14, 2023
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