Implement Markdown Alerts

[gianfa]

Description

The relatively new Markdown Alerts feature would bring more graphically pleasing and more functional handling to the highlighted text

[mcanouil]

It's callouts blocks, see https://quarto.org/docs/authoring/callouts.html.

more graphically pleasing and more functional handling to the highlighted text

Compared to what and for which format?

[gianfa]

I meant comparing to simple quotes style.
I wasn't able to find it, thank you!

So this feature request is already solved :)