The README has been updated to show a code example of both, including an
exemplary screenshot.
Since Hugo 0.55, we have to use `markdownify` in shortcodes that contain
HTML elements. At least we have to, if we want to render markdown code
inside the HTML element.
To use the `<aside>` element, we have to wrap our content in an
`<article>` tag.
This fixes#4.
Co-authored-by: Robert Lützner <robert.luetzner@iternity.com>