feat(frontend): rich OG metadata + dynamic page titles across all routes

thoughts-frontend/app/(auth)/register/layout.tsx

@@ -0,0 +1,10 @@
+import type { Metadata } from "next";
+
+export const metadata: Metadata = {
+  title: "Join Thoughts",
+  description: "Create an account on Thoughts and connect across the Fediverse",
+};
+
+export default function RegisterLayout({ children }: { children: React.ReactNode }) {
+  return children;
+}