Episode 4, Exercise 5 Vizu with Napari

### Brief description
1. Introduce Napari / limitations of matplotlib
2. Give several examples from the demo data how to add 2D images to Napari.
3. Discuss `add_image` parameters such as `contrast_limits`, `colormap`, `blending`
4. Develop mor advanced example using Napari blending to display multi-channel image from several 2D images

### Learning objective(s)
[covered](https://github.com/carpentries-incubator/bioimage-analysis-python/wiki/Learning-Objectives#multi-dimensional-image-visualization-with-napari)

### Volunteer(s)
@sommerc