Enabled printer discovery and moved Canon drivers to right place

See: https://wiki.nixos.org/wiki/Printing

hosts/p14s/configuration.nix

@@ -66,6 +66,16 @@
 
   # Enable CUPS to print documents.
   services.printing.enable = true;
+  services.printing.drivers = with pkgs; [
+    cups-bjnp # CUPS back-end for Canon printers
+  ];
+
+  # Enable autodiscovery of network printers
+  services.avahi = {
+    enable = true;
+    nssmdns4 = true;
+    openFirewall = true;
+  };
 
   # Enable sound with pipewire.
   #sound.enable = true;

hosts/p14s/home.nix

@@ -60,9 +60,6 @@
     wireguard-tools
     nextcloud-client
 
-    # Printing
-    cups-bjnp # CUPS backend for Canon printers
-
     # Internet
     firefox
     #ladybird