Create presentation without registration

[holema]

Hello,
as introduced in my last issue I have a feature request.
It would be great, if there is a possibility to create a presentation witout a user account.
So a presentaion could be created and edited with an admin link and not with an account.

This would improve the project so much.

To make the admin much more secure, it would be possible to send a JWT in the link to make sure, the editor is authenticated.

[stale]

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