[PP-3] Use Gin admin theme

Problem/Motivation

Gin admin theme is now shipped with Drupal CMS as a standard admin theme. Commerce Kickstart should also either set Gin as default theme or make it optional in its installer.

Here are blockers:
- Centarro Claro is now included in the Kickstart base recipe - it must be extracted into a separate module.
- 🐛 Move local tasks to the right Active
- ✨ Compatibility with Gin content form Active