Provide a short how-to integrate this with a Nexcloud installation

[bernd-wechner]

This looks awesome and I'd love to plug it into a NextCloud. NextCloud apparently uses fullcalendar:

nextcloud/calendar#2673

but your example file isn't very instructive on the NextCloud integration front. Of course that may not be a priority, but I am posting here in the hope that someone might take up the challenge and integrate this with a NextCloud installation and post a how-to.