refactor: merge code and update main.css, delete file css in component

app/layout.tsx

@@ -8,8 +8,8 @@ import MouseCursor from "./components/MouseCursor";
 import Script from "next/script";
 
 export const metadata: Metadata = {
-  title: "H.A.I Learning",
-  description: "H.A.I Learning",
+  title: "ULDP",
+  description: "ULDP",
 };
 import "./globals.css";