refs https://github.com/TryGhost/Team/issues/1252
- allows site owners to (un)archive existing tiers via Admin UI
- adds option to switch between archived or active tiers view
Co-authored-by: Djordje Vlaisavljevic <dzvlais@gmail.com>
no refs
- updates unarchive task method used on enter key for the unarchive offer popup
- wrong method was causing the enter key to not unarchive the offer as expected
no issue
- offer-related modals were split across the top-level `modals` directory and the `modals/offers` directory
- normalized to the `modals/offers` directory
