adding caldav/carddav next to dovecot

[Marc]

> 
> Tanstaafl skrev den 2022-10-15 16:11:
> > A HUGE second for SOGo
> 
> https://www.horde.org/
> 
> > We used it for many years in a Gentoo/Dovecot/Postfix environment.
> 
> horde is missing in gentoo now :/

Maybe it is old fashioned or even modern. But I like the idea of smaller single task focussed projects (interfacing with others). All these 'huge' solutions offering all kinds of functionality, how can these development teams be an ace in all these different areas. 
If a single element is being compromised, the whole environment is hacked and accessible.