Enhance content group template preview
To find suitable templates, a preview is required which displays all the necessary information. To do this, we need a preview for all the content it contains. For this PreviewComponent could be used together with StepperComponent to be able to sliding through the contents without navigating back and forth. If further nesting within a dialog cannot be avoided, it makes sense to move the template selection out of the dialog.
Related https://gitlab.com/particify/dev/common-concerns/-/issues/53
Edited by Lukas Weingarten