Create decks without calendars and / or merge several decks into one calendar should be a thing

[nilskamm]

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Is your feature request related to a problem? Please describe.
We use a lot of decks just to work together through different information in quite big teams. At the moment there are just way to many deck calendars in every users calendar view.

Describe the solution you'd like

1. The possibility to create decks without creating a new calendar
2. The possibility to choose an existing calendar to use with a new / existing deck

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[luka-nextcloud]

I believe this PR should resolve this issue.

[ornanovitch]

I believe this PR should resolve this issue.

This is a major step indeed, but there is still no way to generalize an opt-in solution that include future users. With this PR, if I understand correctly, an admin who want to disable globally Deck calendars by default must execute php occ deck:calendar-optin --off each time a new user registers...