Matplotlib Image Figures

Hi Robert,

Super cool collection of notebooks!

One of my tasks is to teach users about bio-image analysis and I am in awe of the beauty of this collection. Thanks a lot for putting it together and making it publicly available. Instead of building my own collection I will totally use this and try to contribute where I can.

By coincidence one of the first things I did was a notebook and `figure_utils.py` that explains/helps users to plot their image data at a given `print/display` resolution: https://github.com/fmi-faim/py_course/blob/main/01-figures-in-python/Figures.ipynb

The target audience would be users that want save results at a requested resolution with a scalebar for publications or posters.

I could find some plotting notebooks, but not one tackling this specific area. If you agree I would like to submit this work as a PR to the repo.

Currently the [`figure_utils.py`](https://github.com/fmi-faim/py_course/blob/main/01-figures-in-python/figure_utils.py) is a standalone collection of utility functions not published via pip. Would you recommend to put it on pip?

Best,
Tim-Oliver

PS: The license can be changed, currently it is MIT.