Updating an event

[fxuls]

• As an authenticated user who is also the organizer of the group, I want to be able to update the details of the event.
  • When I'm on the event details page:
    • I can click an "Update event" button which will redirect me to a form located at /groups/:groupId/edit.
  • When I'm on /groups/:groupId/events/:eventId/edit:
    • I can fill out the same form as the create event with the current event details prefilled.