- We have an existing pattern for using `visibility: public` instead of `visible: true|false`
- We no-op the existing migration and roll forward so that we don't have to manually revert db changes
refs https://github.com/TryGhost/Team/issues/1313
When adding the tiers endpoint the Content API was missed, this is
needed so that themes can access Tiers via the `{{#get}}` helper.