home: create 'modules/home' folder

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

modules/home/wm/rofi/default.nix

@@ -0,0 +1,21 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.home.wm.rofi;
+in
+{
+  config = lib.mkIf cfg.enable {
+    programs.rofi = {
+      enable = true;
+
+      terminal = config.my.home.terminal.program; # null by default
+
+      package = pkgs.rofi.override {
+        plugins = with pkgs; [
+          rofi-emoji
+        ];
+      };
+
+      theme = "gruvbox-dark-hard";
+    };
+  };
+}