docs: make role of getQuartzComponents more clear and also make it optional

Jacky Zhao

2025-03-06 2213424195b6ba761a6bf3343afca43b102d06b3

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import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
import { classNames } from "../util/lang"
 
function Spacer({ displayClass }: QuartzComponentProps) {
  return <div class={classNames(displayClass, "spacer")}></div>
}
 
export default (() => Spacer) satisfies QuartzComponentConstructor