Improve documentation

[skent259]

Goals:

• Complete documentation of functions and modules
• Initial website with this documentation

Long term, want to have a few examples and "getting started"

Resources:

• https://realpython.com/documenting-python-code/
• https://peps.python.org/pep-0257/
• https://numpydoc.readthedocs.io/en/latest/format.html
• https://pandas.pydata.org/pandas-docs/stable/
• https://www.sphinx-doc.org/en/master/tutorial/first-steps.html

[skent259]

Documentation goal: tutorial of how to use strategies (three levels)

• Tutorial (level 1): Using the simple strategies and examples from the package (seeing which are available)
• Tutorial (level 2): Adding strategies together; Building a strategy from the strategy.tools to customize the logic.
• Tutorial (level 3): Writing a custom strategy class with proper logic and overview of the strategy methods

[skent259]

After #50, noticed a few things to keep working on:

• Tutorial output, would be nice if shortened and figure out how to get integers to display (e.g. "6" instead of "np.int64(6)")
• Tutorials on collab for interactivity
• API reference, figure out how to remove certain functions
• Need to continue documenting functions