(fix): scanorama notebook

[ilan-gold]

Towards #79, things need to actually be runable somewhere and this starts that process. Hopefully in the future we can cache outputs. We can also completely deprecate this notebook if we don't want to use it anymore and just redirect to https://squidpy.readthedocs.io/en/stable/notebooks/tutorials/tutorial_tangram.html

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[flying-sheep]

Neat! Since this notebook isn’t high priority, no need to do the following, but this is what I spotted:

1. I’d uncomment the commented cell and change it so only the necessary parts run, but
2. sns.distplot is deprecated and should be replaced

[ilan-gold]

Done @flying-sheep - we can merge whenever.