feat: delete redundant introductions

Author: Ohh-889

playground/src/app/globals.css

@@ -1,7 +1,6 @@
 @import 'tailwindcss';
 
 @source "../../../packages/ui/src/**/*.{ts,tsx}";
-@source "../../../packages/ui-variants/src/**/*.{ts,tsx}";
 @plugin "tailwindcss-animate";
 @config "../../tailwind.config.ts";