Delete unused boards in GitLab.org

We are working to make managing boards more easier. See https://gitlab.com/gitlab-org/gitlab-ee/issues/7305 and https://gitlab.com/gitlab-org/gitlab-ee/issues/7304 and https://gitlab.com/gitlab-org/gitlab-ce/issues/40298 and https://gitlab.com/gitlab-org/gitlab-ce/issues/48847 more generally.

But in the mean time, let's do our part in cleaning up the group boards in GitLab.org, making it easier for everyone to use.

• Everyone please delete boards that you are no longer using. You can simply scroll to the bottom of the dropdown and hit Delete board. (I know this isn't very discoverable. This is being addressed in https://gitlab.com/gitlab-org/gitlab-ce/issues/47721.)
• If you delete a board, please leave a comment here so everyone knows you are contributing to good board hygiene.
• On September 12, 2018, I will delete all boards that are 10.1 ... to 10.8 .... Please post in a comment here if you don't want one of these boards deleted.