ENH: adding euclid clusters tutorial

[bsipocz]

This is a draft PR for now as the notebook runs way too long as is (2+hr locally)

TODO (that came up during making this PR, we may have other things left from the initial review):

• fix figure captions
• add metadata footer
• make sure it runs and runs well within the confines of CI
• cut up code cells, they are way too long and with little narrative in between

Resolves #282

[jkrick]

@bsipocz do you want me to look at how to shorten the runtime of this notebook? and also do you want me to look into adding narrative text? or do you already have a plan?

[bsipocz]

I would appreciate any help, thanks for offering.