Detach fork

[IgorTatarnikov]

Now that this repository is using Python and Quarto, it doesn't make sense for it to be a fork of the parent repository.

See https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/detaching-a-fork for instructions.

[adamltyson]

This repo has it's own forks, which means we will need to do this manually, i.e. create a new repo.