automation for code-driven documentation updates

[plyr4]

Description

this means documentation content that gets updated based on what exists in code.

• generate API response bodies using Swagger definitions
• generate CLI reference docs using CLI command/help output
• generate Plugin docs using things like codeowners

would save us a lot of time
would move things to a centralized source of truth for technical details that dont need extra docs flavoring
would force us to keep swagger + code up to date
might lead into other enhancements like auto generated SDK code and Elm structs