refactor: add docstrings and cleanup #1270

Job	Run time
unit-tests (ubuntu-20.04, 3.9, clean,py39-pytest-cov,report)	2m 33s
linting-and-style-checks (3.9, black)	16s
unit-tests (ubuntu-20.04, 3.9, py39-cookiecutter)	30s
linting-and-style-checks (3.9, flake8)	21s
unit-tests (ubuntu-20.04, 3.10, clean,py310-pytest-cov,report)	2m 51s
unit-tests (ubuntu-20.04, 3.10, py310-cookiecutter)	27s
linting-and-style-checks (3.9, gitlint)	20s
unit-tests (windows-latest, 3.9, clean,py39-pytest-cov,report)	3m 18s
linting-and-style-checks (3.9, isort)	19s
unit-tests (windows-latest, 3.9, py39-cookiecutter)	53s
linting-and-style-checks (3.9, mypy)	33s
unit-tests (windows-latest, 3.10, clean,py310-pytest-cov,report)	3m 5s
unit-tests (windows-latest, 3.10, py310-cookiecutter)	52s
	16m 18s

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