refactored theme configuration to use stylix instead of individually theming each program

modules/home/environment/spicetify.nix

@@ -20,7 +20,5 @@ in {
       hidePodcasts
       shuffle # shuffle+ (special characters are sanitized out of extension names)
     ];
-    theme = spicePkgs.themes.catppuccin;
-    colorScheme = "mocha";
   };
 }