Remove custom lib usage

modules/desktop/mimeapps.nix

@@ -1,17 +1,18 @@
 { config, lib, pkgs, ... }:
 
-with lib;
-with lib.my;
 let
   cfg = config.modules.desktop.mimeapps;
   avApp = "io.github.celluloid_player.Celluloid.desktop";
   imageApp = "org.gnome.eog.desktop";
 in {
   options.modules.desktop.mimeapps = {
-    enable = mkBoolOpt false;
+    enable = lib.mkOption {
+      default = false;
+      example = true;
+    };
   };
 
-  config = mkIf cfg.enable {
+  config = lib.mkIf cfg.enable {
     xdg.mime.defaultApplications = {
       # Audio/video
       "audio/x-vorbis+ogg" = avApp;