Render Markdown files linked from Readme

[sijow]

Description

Currently if a package README.md links to a local Markdown file, that file is served as plain text. It would be nice to render it like the Readme itself.

Use Case

For example version 0.5.0 of the bytefield package has a Readme with a local link to CHANGELOG.md. On the Universe this is translated to a raw GitHub link: https://raw.githubusercontent.com/typst/packages/main/packages/preview/bytefield/0.0.5/CHANGELOG.md which serves plain text.

A simple fix would be to translate such links to non-raw GitHub URLs like https://github.com/typst/packages/blob/main/packages/preview/bytefield/0.0.5/CHANGELOG.md

Probably even nicer would be to serve a rendered file on the Universe itself, with the same styling as the Readme.

[sijow]

I just realized that local links from the readme to other Markdown files are explicitly suggested on https://github.com/typst/packages/blob/main/docs/documentation.md :

More complete documentation (usually written in Markdown, or in a PDF generated from a Typst file) can be linked from this README. [...] If the resources are committed to this repository, you should link them locally.

So maybe this issue would be better classified as a bug