chore(other): add gitbook action

Created by: Tirokk

🍰 Pullrequest

Add gitbook action.

Issues

• fixes #6689

Todo

• cleanup:
  • file file .github/workflows/gitbook-action.yml
    • remove superfluid comments
    • set publish_branch again to master
    • remove publish branch 6689-setup-gitbook-action
    • set pluginsConfig.gtag.token in file book.json