Render EditorComponent on main site

Hello,

I've registered a couple of editor components for the markdown widget that work fine in the preview pane of the Netlify CMS admin panel. However, I was hoping to see the same result on the actual site as well, supposing that either `gatsby-plugin-netlify` or `gatsby-plugin-netlify-cms` would handle that for me, but I realized it's out of their scope.

So the only way I - as a beginner to Gatsby - could work this around, is to use `rehype-react` to parse `htmlAst` and render a shared component between it and `registerEditorComponent's toPreview`.

I am wondering if there is a more elegant solution to do this, until the MDX support gets ready?

Thank you!