remove dark mode

Removed dark mode support from app.css.

Author: yzqzss

frontend/src/app.css

@@ -12,10 +12,3 @@
 body {
 	@apply bg-gray-50 text-gray-900;
 }
-
-/* Dark mode support */
-@media (prefers-color-scheme: dark) {
-	body {
-		@apply bg-gray-900 text-gray-100;
-	}
-}