Time to attack the next big dragon: geogebra.

Eventually we'll list the authors in the frontmatter, as YAML.

Would love to get my paws on the XML export of emaths.education !

Note the markdown=1 attribute.

Also test the multiline markdown notices,
who work out-of-the-box. Brillant!

This should be the final form of the file tree.
It's not perfect, since teachers must be able to read english
to navigate in the directories, but it integrates better with Grav.