Improve code formatting - ruff and mypy

[Ce11an]

As per the discussion on #39, we can implement ruff for code formatting in addition to black. The proposed ruff configuration is as follows:

• isort, which is compatible with black
• pydocstyle, with a preference for Google style but open to suggestions
• flake8
• By using ruff, we won't need the .flake8 file. Additionally, ruff works well with pre-commit hooks.

We should also include mypy for type-checking in the project.

Please let me know your thoughts. Thank you 😄

[AlexFrid]

This all sounds good, closing this issue as the PR for the suggested changes has been merged