Add Roles Based Authentication/Permissions Rules to the Calendar

**Goals**:
- A service provider should be able to add events to the Calendar.
- A user, not logged in, should not be able to add events to the calendar.

**This may involve:**
- AWS
- if statements on the calendar page (or on the link to the calendar page)
- API calls to AWS for authentication

_Useful tips_:
- We might want to add a roles.js to the constants folder.

**Roles**:
- Public (not logged in)
- Service Provider (logged in)

_Note_ to keep in mind but don't need to implement for this card.
- Eventually (Admin (logged in - can do edit, delete, add directly on calendar))