fix: refactor and implement design

apps/web/src/app/(unauthenticated)/layout.tsx

@@ -0,0 +1,27 @@
+import React from 'react';
+
+import Image from 'next/image';
+
+import backgroundPattern from '@documenso/assets/images/background-pattern.png';
+
+type UnauthenticatedLayoutProps = {
+  children: React.ReactNode;
+};
+
+export default function UnauthenticatedLayout({ children }: UnauthenticatedLayoutProps) {
+  return (
+    <main className="relative flex min-h-screen flex-col items-center justify-center overflow-hidden  px-4 py-12 md:p-12 lg:p-24">
+      <div>
+        <div className="absolute -inset-[min(600px,max(400px,60vw))] -z-[1] flex items-center justify-center opacity-70">
+          <Image
+            src={backgroundPattern}
+            alt="background pattern"
+            className="dark:brightness-95 dark:contrast-[70%] dark:invert dark:sepia"
+          />
+        </div>
+
+        <div className="relative w-full">{children}</div>
+      </div>
+    </main>
+  );
+}