[Doc] Add API doc generation

[eddiebergman]

Just needs to be done at some point. Will try when I have some time but if anyone feels like learning how to build documentation for libraries, feel free and I am happy to help guide through.

Refs:

• Plugin setup: https://github.com/automl/amltk/blob/4de8c1c1d0f82bc398044788bca5f09d3ec642d7/mkdocs.yml#L105-L150
• Not all of these are needed, just some of the mkdocs plugins: https://github.com/automl/amltk/blob/4de8c1c1d0f82bc398044788bca5f09d3ec642d7/pyproject.toml#L36-L50
• File that generates the API docs during mkdocs build or whatever command you're using for mkdocs doc generation: docs/api_generator.py
• I also have some custom stylings and templates that apply to the API docs. This was made with trial and error so I don't really know much beyond what I got to work.
  • Templates - just modified based on some guidance and templates provided in mkdocstrings.
  • CSS I think I copied Textual and modified from there.

Example output:

• https://automl.github.io/amltk/latest/api/amltk/optimization/optimizers/neps/#amltk.optimization.optimizers.neps.NEPSOptimizer.create

[eddiebergman]

This was closed in PR #83