[openstack-helm] Storyboard cleanup

Dear Openstack-helmers,

Minor announcement about OSH Storyboard.

During May/2023 I have been putting some effort into cleaning up the Storyboard. More than 50 stories have been reviewed, verified and updated as merged or invalid. Now we still have 44 active stories in the OSH project group and I am going to clean them up even more. Also the infra team helped us to unlink 3 retired OSH projects from the OSH Storyboard project group. So now only active projects openstack-helm, openstack-helm-infra and openstack-helm-images are in the project group.