Cleanup

[dirmeier]

• fix codecov
• fix documentation not showing
• replace all old links (one in index.rst to dirmeier/...)
• beautify code
• gitlint ini, pylintrc, jupytext file, mypy init, pytest ini, setup cfg ,manifest, makefile, pydocstyle, bandit.yaml
• code of conduct, contribuing,
• codecov/coveragerc