kmail/ kde-pim: install via NixOS option instead

Installing the kde-pim sutie is quite complex. Thus, there's a
`programs.kde-pim` in NixOS now to keep track of all necessarry
packages.

Removing the attempted list of necessary packages from explicit NixOS
and home packages instead.

common/default.nix

@@ -158,6 +158,13 @@ in
     wayland.enable = true;
   };
   services.desktopManager.plasma6.enable = true;
+  # TODO: move out into a plasma.nix module
+  programs.kde-pim = {
+    enable = true;
+    kmail = true;
+    kontact = true;
+    merkuro = true;
+  };
   # enable wayland for Chromium and Electron
   environment.sessionVariables.NIXOS_OZONE_WL = "1";
 

common/packages.nix

@@ -48,8 +48,6 @@
     networkmanager-openconnect
     networkmanager-vpnc
     networkmanager-openvpn
-    # TODO: is this still necessary?
-    kdePackages.akonadi-mime # for KOrganizer
     # for some Flatpak packkages
     accountsservice
   ];

home/modules/packages.nix

@@ -198,13 +198,6 @@ let
       okular
       gwenview
       yakuake
-      kmail
-      kontact
-      korganizer
-      akonadi-mime # for KOrganizer
-      kmail-account-wizard
-      akonadi-import-wizard
-      kaddressbook
       kdeconnect
       dolphin
       spectacle