Adding plotting specific documentation

Comment originally from @MeyerBender, thanks for the feedback!

documentation: in general, I think it would be good to have one or two notebooks that exclusively focus on visualization. Right now, it is very hard to find this in the spatialdata docs. Maybe something similar to this, which shows off the most important plotting functions in spatialproteomics.

Currently we have plotting notebooks but hidden under the "Technology-specific" section in the docs. And we have another notebook in a separate repo (=not really discoverable).

Improving the docs with a visualization-specific notebook that is easily discoverable would be valuable.

Commencez par examiner les notebooks de plotting de la section "Technology-specific" de la documentation ainsi que le spatialdata-workshops/notebooks/nb2_static_plotting.ipynb existant. Identifiez les principales fonctions de plotting et la manière dont les notebooks sont liés dans la documentation. Le travail est considéré comme terminé lorsqu’un notebook axé sur la visualisation est facile à trouver dans la documentation de spatialdata-plot et couvre les fonctions de plotting importantes.