refactor: remove outdated headless checkbox component

Author: thejackshelton

packages/kit-headless/src/components/checkbox/checkbox.tsx

@@ -1,6 +1,5 @@
 export * as Accordion from './components/accordion/';
 export * as Carousel from './components/carousel';
-export * as Checkbox from './components/checkbox/checkbox';
 export * as Collapsible from './components/collapsible';
 export * as Combobox from './components/combobox';
 export { type ResolvedOption } from './components/combobox';