[hk1337]

Maybe keep your documentation in a single directory?

  on:
    push:
      branches:
        - main
      paths:
        - docs/**
        - README.md

I use something similar for triggering different app workflows in a monorepo.

*EDIT* Or in multiple directories but grouped into multiple documentation directories.

  on:
    push:
      branches:
        - main
      paths:
        - package1/docs/**
        - package2/docs/**
        - package3/docs/**
        - README.md