feat: Follow-up component documentation feature

[jaredcwhite]

(Follow-up because this wouldn't be addressed until after we merge in #268)

The video isn't yet available publicly, but having watched Joel Hawksley's presentation on how GitHub is using ViewComponent, he mentions a tool they built which parses YARD documentation for components and converts descriptions, parameters, examples, etc. into Markdown for use in a documentation site for their component library.

Hmm, Markdown. If only I knew of a tool that can render Markdown for a website… 🧐😂

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Jokes aside, it's a really cool idea and one that I'd like to shamelessly clone as a plugin for Bridgetown. Imagine writing Ruby components in src/_components (whether our own solution, ViewComponent, or anything else really), running a single command, and boom all your components are documented with live examples. 🤯

I built something similar for "Liquid components" (currently broken unfortunately), but now that I'm moving away from promoting that functionality this would be a fantastic alternative.