Add notebooks to readthedocs

[julistanley]

Should be straightforward, instructions here: https://docs.readthedocs.io/en/stable/guides/jupyter.html

[miraep8]

Sounds like a good idea/agree it should be easy! Let me know if you want to work on this, or if you would prefer I do it (just so we don't end up both doing it, or neither doing it lol)

[miraep8]

I have been thinking more about this recently. Definitely think this is a high priority ask/will make it easier for people to use! I am thinking about doing this in combo with a switch from sphinx theme to a jupyter book theme! - Note I think that the Jupyter notebooks should also work with the sphinx theme, I just think it will be even easier with Jupyter Book, and I also think it looks prettier too! :)