Why does the markdown plugin only accept markdown text returned from the route /true?

[ooker777]

Investigating #3653 I realize that I need to create a route true. Only in that then I can inject markdown text:

const markdown = `
## Slide 1
A paragraph with some text and a [link](https://hakim.se).
---
## Slide 2
---
## Slide 3
`;
export const handler = () => {
  return new Response(markdown);
};

Why is it designed like that?

[baba43]

I also have no clue why this is is necessary lol