StyleGuide component

Take a styleguide schema input, with template wrapper overrides. Needs to be platform specific to resolve page/artboard/frame components.

e.g. for `StyleGuide.sketch.js`

```jsx
const StyleGuide = () => (
<>
{styleguide.map(({
type, name, screens, data, pages,
}) => (
<>


{screens.map(({ name: screenName, component: Component, data: compData }) => (



))}


{pages && pages.map(page => (


{pages.map(({ name: screenName, component: Component, data: compData }) => (



))}


))}

))}

);
```

Start with the StyleGuide.sketch.js example in the issue and inspect the repository for the existing style-guide generator entry point. Determine how a schema input and template wrapper overrides should map to platform-specific page, artboard, and frame components. Done means the StyleGuide component supports the described schema and platform resolution behavior.

Written by the indexing model from the issue text.