Add collapsible sections to the generated Markdown

[mole99]

CACE could add collapsible sections to the generated Markdown summary.
One downside is that the <detail> tag is part of HTML and not of Markdown and may not be rendered correctly everywhere.

Click me

Heading

1. Foo
2. Bar
   • Baz
   • Qux

Some Javascript

function logSomething(something) {
  console.log('Something', something);
}