feat(system): add fonts and printing support

modules/system/fonts.nix

@@ -0,0 +1,15 @@
+{ pkgs, lib, ... }:
+
+{
+  fonts.packages =
+    let
+      nerdFonts = builtins.filter lib.isDerivation (lib.attrValues pkgs.nerd-fonts);
+    in
+    [
+      pkgs.adwaita-fonts
+      pkgs.open-fonts
+      pkgs.google-fonts
+      pkgs.noto-fonts
+    ]
+    ++ nerdFonts;
+}

modules/system/printer.nix

@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+
+{
+  services.printing = {
+    enable = true;
+    drivers = [
+      # The generic CUPS and Gutenprint drivers usually suffice for most printers
+      # Uncomment the drivers for your printer brand in case these don't work
+
+      # pkgs.brgenml1cupswrapper # Brother printer drivers
+      # pkgs.brgenml1lpr # Brother printer drivers
+      # pkgs.brlaser # Brother laser printer drivers
+      # pkgs.cnijfilter2 # Canon Pixma drivers
+      pkgs.cups-filters
+      pkgs.cups-browsed
+      # pkgs.epson-escpr # Epson printer drivers
+      # pkgs.epson-escpr2 # Newer Epson printer drivers
+      pkgs.gutenprint # Various printer drivers
+      pkgs.gutenprintBin # Various binary printer drivers
+      # pkgs.hplip # HP printer drivers
+      # pkgs.hplipWithPlugin # HP printer drivers with proprietary plug-ins
+      # pkgs.postscript-lexmark # Lexmark printer drivers
+      # pkgs.samsung-unified-linux-driver # Samsung printer drivers
+      # pkgs.splix # Drivers for Samsung Printer Language printers
+    ];
+  };
+}

modules/system/services.nix

@@ -1,5 +1,12 @@
 { ... }:
 
 {
-  services.openssh.enable = true;
+  services = {
+    avahi = {
+      enable = true;
+      nssmdns4 = true;
+      openFirewall = true;
+    };
+    openssh.enable = true;
+  };
 }