Write Documentation

[dougbrn]

We should populate the readthedocs, the mvp demos should be a good base for this: https://github.com/lincc-frameworks/notebooks_lf/tree/main/nested-pandas-mvp

Let's try to make sure that all demo notebooks are runnable from any user environment (do not point to data stored in the test directory for example).

• Docs: installation and contribution #46
• Docs: tutorial notebook with high-level interface #47
• Docs: tutorial notebook with accessors and low-level interface #48
• Docs: Tutorial Notebook for data-loading #68
• Revise Intro Section #80