Looks good, thanks.
Do we need to add this to a menu or something?

I think so, but I don't know how to.

@codex128 See the file docs/modules/core/nav.adoc. You can see the nav being built there (other files build other parts of the nav but I think thats the one you want). You can see that the parentage is defined by the depth of the *s and there is a simple file path and name specified for the nav item.

I think your xref would be xref:material/normal-types.adoc

So e.g.

** xref:material/normal-types.adoc[Your title goes here]

But you'd need to decide exactly where it goes

Ah, thanks! I will look into that when I get the chance.