Kubebuilder migration
Migrate to using kubebuilder for project scaffolding and code generation. This includes removing the initial src/gitlab.com/gitlab-operator
subdirectories (I can revert that change if there was a particular reason for structuring the project like that).
Fixes: #1
This relies on https://gitlab.com/gitlab-org/distribution/gitlab-operator/merge_requests/1
Edited by Luke Addison