anyone know how to edit:
https://github.com/barisusakli/nodebb-plugin-topic-noindex This is a plugin that does it for topics.
There is no built in way to do it in core. So to do it for categories you would have to fork and extend the above plugin.
@exodo that helps. Thank you for the response.
@julian thanks that's good to know.
I'll do as @pichalite recommended and fork the theme then.
Awesome! Thanks guys!