Allow a card/task to be updated from the calendar page

[pedroponte]

Problem statement

No option to edit deck card from the calendar page. On the other hand, calendar with tasks enabled allow drag and drop to update the time, whereas deck cards do not.

Describe the solution you'd like

1. Ability to have a popup to allow editing the deck card and the calendar task from the calendar page
2. Allow deck cards to be draggable like the calendar tasks to allow updating its date/time more conveniently

[pedroponte]

related to https://github.com/nextcloud/deck/issues/4878