User docs improvements ideas

State the minimum Python version in the README (cf. #208)
State the operating system under which the script is supposed to work => the Makefile can only be used with a bash. Alternative way? (cf. #209)
If you support both pip and pipenv, please provide running instructions without pipenv as well. Maybe poetry would be a better fit?
Please provide a working example including the expected results (images etc.). In addition, one could check the example in the CI build as well. (cf. #210)

Edited Jun 30, 2022 by Hueser, Christian

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