Document how to use Auto Deploy with the Agent
Scope
We shipped support for Auto DevOps using the GitLab Agent in #299350 (closed) but we missed the documentation.
This issue is to document how to use Auto DevOps with the GitLab Agent.
Proposal
Check and update https://docs.gitlab.com/ee/user/infrastructure/clusters/migrate_to_gitlab_agent.html#migrate-from-auto-devops
Be inspired by https://about.gitlab.com/blog/2022/02/08/gitops-with-gitlab-auto-devops/
Edited by Viktor Nagy (GitLab)