05Mocks.ipynb might be improved

[mxochicale]

Fundamentals for Mocking in Python (e.g., https://github-pages.ucl.ac.uk/rsd-engineeringcourse/ch03tests/05Mocks.html and https://github.com/UCL/rsd-engineeringcourse/blob/main/ch03tests/05Mocks.ipynb) might be improved. See few notes:

• [x] introduction is fine but not entirely sure if is necessary to add definitions of the word mocking, I might like to see more related description and references to python programming:
  • https://realpython.com/python-mock-library/
  • https://www.toptal.com/python/an-introduction-to-mocking-in-python
  • https://stackoverflow.com/questions/2665812/what-is-mocking
• [x] No clear aims of what is covered in the notebook nor table of contents.
• [x] displays unnecessary cells
• [x] no explicit description of the displayed errors
• [x] no real-world examples. Maybe we can add few of them from UCL research groups: https://github.com/SciKit-Surgery/scikit-surgerynditracker/tree/master/tests https://github.com/SciKit-Surgery/scikit-surgerybk/blob/master/tests/test_bk_connection.py https://github.com/lowe-lab-ucl/napari-btrack/blob/main/napari_btrack/_tests/test_dock_widget.py
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