Auto-generate md documentation

[e-lo]

As a maintainer, I don't want to have to worry about updating the markdown documentation to be in sync with the code-based specification.

As a user, I want the certainty that the markdown documentation is the same as the code-based specification.

Proposed Solution

The markdown documentation can and should be automatically generated from the code-based documentation. This has been proven in the gmnspy package and I (@e-lo) am happy to implement here if given go-ahead by community.

[e-lo]

cc: @joecastiglione on if community would like me to implement.

[ianberg-volpe]

should've been closed by #88