refactor: update hero section content and improve user button behavior

- Changed the hero section title and description to better reflect the MkSaaS offering.
- Updated the user button to use `replace` instead of `push` for navigation after sign out, ensuring a smoother user experience.
- Modified the delete account card to also use `replace` for navigation after account deletion, enhancing consistency in routing behavior.

src/components/blocks/hero/hero-section-4.tsx

@@ -24,19 +24,18 @@ export default function HeroSection4() {
                   <span className="bg-muted rounded-[calc(var(--radius)-0.25rem)] px-2 py-1 text-xs">
                     New
                   </span>
-                  <span className="text-sm">Introduction Tailus UI Html</span>
+                  <span className="text-sm">Introduce MkSaaS</span>
                   <span className="bg-(--color-border) block h-4 w-px"></span>
 
                   <ArrowRight className="size-4" />
                 </Link>
 
                 <h1 className="mt-8 text-balance text-4xl font-semibold md:text-5xl xl:text-6xl xl:[line-height:1.125]">
-                  Modern Software testing reimagined
+                  Launch your AI SaaS the easiest way
                 </h1>
                 <p className="mx-auto mt-8 hidden max-w-2xl text-wrap text-lg sm:block">
-                  Tailwindcss highly customizable components for building modern
-                  websites and applications that look and feel the way you mean
-                  it.
+                  MkSaaS is a boilerplate for building modern AI SaaS applications
+                  with Next.js, Tailwind CSS, Shadcn UI, Better Auth, Resend, Stripe, and Vercel AI SDK.
                 </p>
                 <p className="mx-auto mt-6 max-w-2xl text-wrap sm:hidden">
                   Highly customizable components for building modern websites

src/components/layout/user-button.tsx

@@ -38,7 +38,7 @@ export function UserButton() {
       fetchOptions: {
         onSuccess: () => {
           console.log('sign out success');
-          localeRouter.push('/');
+          localeRouter.replace('/');
         },
         onError: (error) => {
           console.error('sign out error:', error);

src/components/settings/account/delete-account-card.tsx

@@ -60,11 +60,14 @@ export function DeleteAccountCard() {
         onSuccess: () => {
           toast.success(t('deleteAccount.success'));
           refetch();
-          router.push('/');
+          router.replace('/');
         },
         onError: (ctx) => {
           console.error('delete account error:', ctx.error);
-          // { "message": "Session expired. Re-authenticate to perform this action.", "code": "SESSION_EXPIRED_REAUTHENTICATE_TO_PERFORM_THIS_ACTION", "status": 400, "statusText": "BAD_REQUEST" }
+          // { "message": "Session expired. Re-authenticate to perform this action.", 
+          // "code": "SESSION_EXPIRED_REAUTHENTICATE_TO_PERFORM_THIS_ACTION", 
+          // "status": 400, "statusText": "BAD_REQUEST" }
+          // set freshAge to 0 to disable session refreshness check for user deletion
           setError(`${ctx.error.status}: ${ctx.error.message}`);
           toast.error(t('deleteAccount.fail'));
         },