Request: Rich text in callout boxes (as implemented in SEEK docs)

[PhilReedData]

I have wanted to include rich formatted text in the callout boxes for some time. I have implemented this on FAIRDOM-SEEK Docs:

https://docs.seek4science.org/help/user-guide/isa-temporary-links

https://github.com/seek4science/seek-documentation/blob/main/_includes/callout-markdownify.html

This include file is based on callout.html but includes a title property and applies the markdownify filter to the content. It still supports the four types of callout.

https://github.com/seek4science/seek-documentation/blob/main/help/user-guide/isa-temporary-links.md

In this example, the content is written in the front-matter, using the multiline |- operator. The callout is used multiple times on the same page, in a loop. But of course it could be used, without the loop.

Is this something that I should add to base ETT in a pull request? If so, what would you want to be changed?

[bedroesb]

@PhilReedData Hey!

This also ties back to: #235 where I propose a simpler syntax as seen in Just the docs, what do you think?

Long story short, this looks like a nice addition

[PhilReedData]

That syntax from Just the docs looks very nice. I assume you could add theme variables to adjust the colours (background and border) as well. If you are going to add that simpler callout anyway, I don't need to make a PR with my code.

I do like callouts to have a coloured background (if the contrast between text and background is accessible). I'm sure the Just the Docs one could have that too.