Revert "Set unpublished MMO artefacts to "archived"."
Merge pull request #186 from alphagov/revert-185-mark-unpublished-mmo-slugs-as-archived

Revert "Set unpublished MMO artefacts to "archived"."
Archive unpublished MMO slugs (correctly).
Merge pull request #187 from alphagov/mark-unpublished-mmo-slugs-as-archived-v2

Archive unpublished MMO slugs (correctly).