🧹 Moved almost all files to /modules. Moved some code to separate files

modules/gnome/nautilus.nix

@@ -0,0 +1,13 @@
+{ pkgs, ... }:
+
+{
+  environment.systemPackages = with pkgs; [
+    nautilus
+    ffmpegthumbnailer
+  ];
+
+  programs.nautilus-open-any-terminal = {
+    enable = true;
+    terminal = "kitty";
+  };
+}