[Feature Request] Unauthenticated, but hard-to-guess caldav URLs
Keep the existing caldav URLs that are present on the settings page, but also have the option for an unauthenticated version where you are able to rotate the semi-secret value that comprises it.
This would be useful for integration with apps that don't let you specify credentials or expect to be looking at a public calendar (like Google Calendar), but still be hard enough to guess that it's basically private.
I guess this would be similar to a read-only share link for a list.
I think that could (should) be built on top of share links.
The other problem is currently, caldav is implemented as "hey Vikunja, give me all lists for that account" and not really "hey give mit that list" but I think we should be able to work around that.
Deleting a branch is permanent. It CANNOT be undone. Continue?