feat(app): remove backend

ui/app/library/layout.tsx

@@ -1,12 +0,0 @@
-import { Metadata } from 'next';
-import React from 'react';
-
-export const metadata: Metadata = {
-  title: 'Library - Perplexica',
-};
-
-const Layout = ({ children }: { children: React.ReactNode }) => {
-  return <div>{children}</div>;
-};
-
-export default Layout;