Custom code import does not always work

[atemate]

https://github.com/neuromation/cookiecutter-neuro-project/blob/03d78fac4fabd59afe7017b24ab642f06beb9ed5/%7B%7Bcookiecutter.project_slug%7D%7D/Makefile#L317

this does not work when run from Web Shell. Need more general case where the code is imported right in Jupyter Notebook -- for example sys.path.append("..")

[YevheniiSemendiak]

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