feat: update dependencies and refactor layout and homepage components

- Added new dependencies: @daveyplate/better-auth-ui, next-themes, and sonner.
- Refactored layout component to use Providers and Toaster for better state management and notifications.
- Updated homepage to utilize authClient for session management and improved user experience with navigation links for sign-in and sign-up.

app/auth/[path]/page.tsx

@@ -0,0 +1,22 @@
+import { AuthView } from "@daveyplate/better-auth-ui";
+import { authViewPaths } from "@daveyplate/better-auth-ui/server";
+
+export const dynamicParams = false;
+
+export function generateStaticParams() {
+  return Object.values(authViewPaths).map((path) => ({ path }));
+}
+
+export default async function AuthPage({
+  params,
+}: {
+  params: Promise<{ path: string }>;
+}) {
+  const { path } = await params;
+
+  return (
+    <main className="flex min-h-screen flex-col items-center justify-center p-4">
+      <AuthView path={path} />
+    </main>
+  );
+}