refactor(comment): remove debug comment
feat(notification): add notification via Notify module
feat(panels): add notify + edit mode for service panel

- Notify on success/failure when member is added/removed to/from a service
- Add a new edit mode to service in order to manage them (sort of mini-backoffice)
- Extract panel style from main.scss and place it in the shared folder
refactor(controller/service): extract controller logic to services (phase 1)
refactor(promises): refactor services with promises (first big step)