Use docstring content in documentation

[rogermparent]

technical question - can we use docstring from an external repo as a gatsby

Yep! Anything that can be accessed with Node.js can be turned into a Gatsby node. I was thinking of making prism commands exported like this to get around our multi-repo command woes. We can also consume that node in any way we want, including having doc pages display the docstring content alongside some optional extra elaboration.

Originally posted by @rogermparent in #3927 (comment)

This Issue tracks the feature request of using docstring content from external repos in our docs. What repos and how we use them is still up for discussion.