[rewrite] Updated frontend structure and played with custom routes

frontend/src/pages/errors/forbidden.tsx

@@ -0,0 +1,25 @@
+import { useNavigate, useRouter } from "@tanstack/react-router";
+import { Button } from "@/components/ui/button";
+
+export default function ForbiddenError() {
+	const navigate = useNavigate();
+	const { history } = useRouter();
+	return (
+		<div className="h-svh">
+			<div className="m-auto flex h-full w-full flex-col items-center justify-center gap-2">
+				<h1 className="text-[7rem] font-bold leading-tight">403</h1>
+				<span className="font-medium">Access Forbidden</span>
+				<p className="text-center text-muted-foreground">
+					You don't have necessary permission <br />
+					to view this resource.
+				</p>
+				<div className="mt-6 flex gap-4">
+					<Button variant="outline" onClick={() => history.go(-1)}>
+						Go Back
+					</Button>
+					<Button onClick={() => navigate({ to: "/" })}>Back to Home</Button>
+				</div>
+			</div>
+		</div>
+	);
+}