home: create 'modules/home' folder

Consolidating all modules under the same path, to clear out the
top-level directory.

modules/home/gtk/default.nix

@@ -0,0 +1,33 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.home.gtk;
+in
+{
+  options.my.home.gtk = with lib; {
+    enable = mkEnableOption "GTK configuration";
+  };
+
+  config.gtk = lib.mkIf cfg.enable {
+    enable = true;
+
+    font = {
+      package = pkgs.dejavu_fonts;
+      name = "DejaVu Sans";
+    };
+
+    gtk2 = {
+      # That sweet, sweet clean home that I am always aiming for...
+      configLocation = "${config.xdg.configHome}/gtk-2.0/gtkrc";
+    };
+
+    iconTheme = {
+      package = pkgs.gnome.gnome-themes-extra;
+      name = "Adwaita";
+    };
+
+    theme = {
+      package = pkgs.gnome.gnome-themes-extra;
+      name = "Adwaita";
+    };
+  };
+}