Since we are going to handle the API stuff later we can just leave this as error case since the model validations will stop this

Per discussion in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9646#note_65730532 this logic is being optimized elsewhere and it will simplify things if we make less changes to this code right now.

Rename `runner.belonging_to_group(project.id) -> runner.belonging_to_parent_group_of_project(project.id)`

Link back to root Helm chart page for deprecated GitLab chart

See merge request gitlab-org/gitlab-ce!18442

Explain Auto DevOps better

See merge request gitlab-org/gitlab-ce!18282

Make ghe url consistent ce docs

See merge request gitlab-org/gitlab-ce!18334

Add better explanation for CI_PIPELINE_SOURCE

See merge request gitlab-org/gitlab-ce!18111

Resolve "The screenshots on the Groups documentation page are outdated"

Closes #45653

See merge request gitlab-org/gitlab-ce!18542