nixos/desktop: use pcmanfm for desktop installations

nix-os/core-desktop.nix

@@ -19,6 +19,7 @@
 
     environment.systemPackages = with pkgs; [
       mpv
+      pcmanfm
     ];
 
     services.openssh.extraConfig = ''

nix-os/dconf-common.nix

@@ -64,6 +64,7 @@
         ];
         favorite-apps = [
           "kitty.desktop"
+          "pcmanfm.desktop"
           "vivaldi-stable.desktop"
           "code.desktop"
           "org.gnome.Nautilus.desktop"

nix-os/desktopManagers/cosmic.nix

@@ -9,6 +9,7 @@
     environment.cosmic.excludePackages = with pkgs; [
       cosmic-edit
       cosmic-term
+      cosmic-files
     ];
   };
 }

nix-os/desktopManagers/gnome.nix

@@ -68,6 +68,7 @@ in
       gnome.seahorse
       gnome.totem
       gnome.yelp
+      gnome.nautilus
     ];
 
     environment.systemPackages = with pkgs; [

nix-os/services/nix-binary-cache.nix

@@ -1,7 +1,10 @@
+{ pkgs, ... }:
+
 {
   config = {
     services.nix-serve = {
       enable = true;
+      package = pkgs.nix-serve-ng;
       secretKeyFile = "/var/cache-priv-key.pem";
     };
   };