Documentation: Add a wake model description page

[RHammond2]

Create high-level documentation for the wake models

This PR adds in a page (with content!) for the wake model theory and how our example model settings relate to each other. The content is structured as a combination of prose and code to be more effective for users.

In addition, this PR fixes the maximum version for the jupyter-book dependency to avoid a slew of documentation build errors, and adds Jupyter checkpoint files to the .gitignore configuration.

@rafmudaf and @paulf81 it would be great to get some direct edits from the both of you to fill in the sparse documentation that was copied over from our existing and old documentation pages about what the models are, and how they relate.

Related issue

N/A

Impacted areas of the software

• setup.py: Fixes the jupyter-book maximum version
• .gitignore: Adds in Jupyter checkpoint files

[rafmudaf]

@paulf81 can you check what I've written for the velocity models here and expand on the TurbOPark and CC models?

[rafmudaf]

There's always more to add to the docs but this is a good start.

[paulf81]

The page looks awesome, thank you @rafmudaf !