Make example notebooks

[xhgchen]

From @hmacdope on Discord:

Create a directory with Jupyter notebooks that have examples + detailed explanations

Good reference: https://github.com/MDAnalysis/solvation-analysis/blob/main/docs/tutorials/basics_tutorial.ipynb

[orionarcher]

I believe nbsphinx is the package you'll need to convert jupyter notebooks to docs, see the SA conf.py here