sks,nixos/sks: Various minor improvements
Module:
- Add a webroot option (serve a website by default, makes the setup easier)
- Explicitly set a group (instead of using 65534/nogroup)
- Move pkgs.sks from environment.systemPackages to the "sks" user and add pkgs.db
Package:
- Adapt the output of "sks version" to NixOS
- Copy the example webpages to $webSamples
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