Hide macro from docs

[alf-mindshift]

Describe the feature

We have some macros in our project that are not relevant to the consumers of our documentation site. Issue #1671 and pr #2179 came very close to delivering the necessary functionality to hide them.

Describe alternatives you've considered

We can post-process the manifest.json file instead. This would be annoying and only fix the problem for us. A general solution would be better.

Additional context

This is a trivial change.

Who will this benefit?

This makes it easier to tweak the documentation site to work for less technical people.

[drewbanin]

Thanks for opening this issue @alf-mindshift. I think the root issue here is that the show config is not compiled into the manifest.json file. Once we make that change, we can make the corresponding change in the docs website to remove these hidden nodes from the file tree.