Add more diagrams to the component docs

[kate-goldenring]

Can make the book more consumable

More graphics/images: Images and graphics drive our point home and help with retention. We should consider reinforcing concepts graphically with ALT text + captions. We must consider the graphic/imaging software we intend to use with our current SSG since not all frameworks integrate well with every SSG.

There is a way to make diagrams work in both light and dark mode -- we should use this magical technique if we can

ref https://github.com/bytecodealliance/component-docs/issues/101#issue-2172995182