[WIP] add props table to docs

[VinSpee]

add a props table to each component's docs.

as mentioned in #197

this is a WIP, I'll remove the [WIP] from the title when its' ready for review - just wanted to throw this out there to start the discussion. I'm sure there will be tweaks to language and presentation.

[VinSpee]

that is of course unless you prefer to just merge them once they're written, component by component

[johno]

This lgtm, it's a huge improvement because it wasn't even documented before : ). Do you mind keeping the js block as standard style? 💟

[VinSpee]

@johno oop yeah no problem, prettier auto-prettied it