Move HM modules

modules/hm/gnome_shell.nix

@@ -0,0 +1,32 @@
+{ pkgs, ... }:
+
+let
+  gnomeExtensions = with pkgs.gnomeExtensions; [
+    appindicator
+    aylurs-widgets
+    babar
+    caffeine
+    dash-to-dock
+    dash-to-panel
+    # dash-to-plank
+    # devbar
+    dock-from-dash
+    # espresso
+    # focus
+    freon
+    gamemode
+    # git
+    gtile
+    # jiggle
+    just-perfection
+    # keyman
+    spotify-tray
+    topiconsfix
+    # tray-icons
+    tray-icons-reloaded
+    unite
+    user-themes
+    # vitals
+  ];
+in
+{ home.packages = [ pkgs.gnome.gnome-tweaks ] ++ gnomeExtensions; }