Add qtwebsockets to flake

[djmaze]

This allows using the HomeAssistant plugin.

[LuckShiba]

I'm not sure if adding qtwebsockets to the Flake to all users is a good idea, since not all users will use that functionality and it's also not a dependency in other distros. What about we add in the package an option to pass additional packages, so the user can do the following:

programs.dankMaterialShell.package = dmsPkgs.dms-shell.override {
  extraQmlPackages = with pkgs; [ qtwebsockets ];
};

This would allow users to add other QML dependencies other plugins may require too!

[djmaze]

@LuckShiba Sounds like a good idea! I can try to implement that.