Real-time push updates

[Nyco]

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Is your feature request related to a problem? Please describe.
Deck allows collaborative editing, but not in real-time: this sometimes leads to editing conflicts

Describe the solution you'd like
When I open a card, update the card's fields in real-time push, when someone else is editing it at the same time

Describe alternatives you've considered
Lock the card?

Additional context
Is it technically feasible?

[stefan-niedermann]

Please use the search function before opening new issues.

Duplicate of #256