Document Google Domain verification
Arising from https://gitlab.developers.cam.ac.uk/uis/devops/raven/deploy-raven-core/issues/3, document Google Domain verification process.
GitLab will be upgraded on 17-Feb-2025 between 12:00 and 14:00. There may be small periods of service instability.
Arising from https://gitlab.developers.cam.ac.uk/uis/devops/raven/deploy-raven-core/issues/3, document Google Domain verification process.