nix: refactor modules pass 2

nix/configurations/vanadium/gui.nix

@@ -1,57 +0,0 @@
-{pkgs, ...}: {
-  services.xserver.windowManager.xmonad = {
-    enable = true;
-    extraPackages = hs: [
-      # https://github.com/ValveSoftware/steam-for-linux/issues/9376
-      # opt into 0.18.1 specifically
-      hs.xmonad-contrib_0_18_1
-    ];
-  };
-
-  services.xserver = {
-    enable = true;
-    autoRepeatDelay = 300;
-    autoRepeatInterval = 40;
-  };
-
-  services.xserver.displayManager.lightdm = {
-    enable = true;
-    background = "#000000";
-    greeters.gtk.cursorTheme = {
-      name = "volantes_cursors";
-      package = pkgs.volantes-cursors;
-      size = 64;
-    };
-  };
-
-  services.xscreensaver.enable = true;
-
-  services.picom = {
-    enable = true;
-    backend = "glx";
-    vSync = true;
-    fade = true;
-    fadeDelta = 3;
-    settings = {
-      fade-exclude = [
-        "name = 'Fcitx5 Input Window'"
-        "class_g = 'fcitx'"
-        "class_i = 'fcitx'"
-      ];
-      blur = {
-        method = "dual_kawase";
-        strength = 5;
-      };
-      wintypes = {
-        dropdown_menu = {
-          opacity = 1;
-          blur-background = false;
-        };
-        popup_menu = {
-          opacity = 1;
-          blur-background = false;
-        };
-      };
-    };
-  };
-}