[Feature request]: `<details>` support

Hi. I was thinking about showing some collapsible source code and found that it can be done using markdown: https://gist.github.com/pierrejoubert73/902cc94d79424356a8d20be2b382e1ab#gistcomment-2705100

In devcards, it doesn't work with code blocks though.

This works (`hidden text` is visible only after clicking the arrow):
```

Source
hidden text

```

This doesn't work (code block is not inside `details` element anymore in DOM):
````

Source
```clojure
(prn \"hello\")
```

````