Add registration end date to the course pages

[Quiddlee]

📝 Describe the feature

We want additionally to start date, add registration end date to the course pages and course cards

The course data already contain registration end date field. The task is about to how and where this should be displayed

✅ Definition of Done (DoD):

1. Investigate how the registration end date should be displayed on the course pages
2. investigate should we add the registration end date to the course cards as well
3. implement the desired