Add newsletter unsubscribed page (#776)

* Add newsletter unsubscribed page

* Update metadata

app/(standalone)/newsletter/unsubscribed/page.tsx

@@ -0,0 +1,45 @@
+import type { Metadata } from "next";
+import Link from "next/link";
+
+export const metadata: Metadata = {
+  title: "You are now unsubscribed. We are sad to see you go.",
+  robots: {
+    follow: false,
+    index: false,
+  },
+};
+
+export default function NewsletterUnsubscribedPage() {
+  return (
+    <div className="relative isolate min-h-svh overflow-hidden bg-black py-16 sm:flex sm:items-center sm:py-24 lg:py-32">
+      <div className="mx-auto max-w-7xl px-6 lg:px-8">
+        <div className="mx-auto max-w-2xl grid-cols-1 gap-x-8 gap-y-16">
+          <div className="max-w-xl lg:max-w-lg">
+            <h2 className="text-3xl font-bold tracking-tight text-white sm:text-4xl">
+              You are now unsubscribed.
+            </h2>
+            <p className="mt-4 text-lg leading-8 text-gray-300">
+              We are sad to see you go. If you change your mind, you can always{" "}
+              <Link className="underline" href="/newsletter">
+                resubscribe
+              </Link>
+              .
+            </p>
+          </div>
+        </div>
+      </div>
+      <div
+        className="absolute left-1/2 top-0 -z-10 -translate-x-1/2 blur-3xl xl:-top-6"
+        aria-hidden="true"
+      >
+        <div
+          className="aspect-[1155/678] w-[72.1875rem] bg-gradient-to-tr from-orange-300 to-pink-500 opacity-30"
+          style={{
+            clipPath:
+              "polygon(74.1% 44.1%, 100% 61.6%, 97.5% 26.9%, 85.5% 0.1%, 80.7% 2%, 72.5% 32.5%, 60.2% 62.4%, 52.4% 68.1%, 47.5% 58.3%, 45.2% 34.5%, 27.5% 76.7%, 0.1% 64.9%, 17.9% 100%, 27.6% 76.8%, 76.1% 97.7%, 74.1% 44.1%)",
+          }}
+        />
+      </div>
+    </div>
+  );
+}