Qutree

Fix

- refactor release env
- make bloch sphere background transparent

Refactor

- replace link from 12rambau branch
- move the badges to the top of the file

Fix

- use file from git repo

Refactor

- typo in binder link
- typo in binder link

Feat

- add dst file option (6)
- add demo
- add BBT class

Fix

- use any pathlike object
- access distant data in examples
- improve CD/CI

Refactor

- solve mypy checks
- lint with ruff