configure-github-repo: Tighten language
configure-github-repo: Tighten language

Co-Authored-By: Ben Thorner <90b91a8305da3dfd8069e2ed1b938f1452d09955@users.noreply.github.com>
alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs