Switch to snowfall flake configuration

modules/system/fonts/default.nix

@@ -0,0 +1,30 @@
+{ options, config, pkgs, lib, ... }:
+
+with lib;
+#with lib.internal;
+let cfg = config.custom.system.fonts;
+in
+{
+  options.custom.system.fonts = with types; {
+    enable = mkBoolOpt false "Whether or not to manage fonts.";
+    fonts = mkOpt (listOf package) [ ] "Custom font packages to install.";
+  };
+
+  config = mkIf cfg.enable {
+    environment.variables = {
+      # Enable icons in tooling since we have nerdfonts.
+      LOG_ICONS = "true";
+    };
+
+    fonts.fontDir.enable = true;
+
+    fonts.fonts = with pkgs;
+      [
+        noto-fonts
+        noto-fonts-cjk-sans
+        noto-fonts-cjk-serif
+        noto-fonts-emoji
+        (nerdfonts.override { fonts = [ "Hack" ]; })
+      ] ++ cfg.fonts;
+  };
+}