Update newsletter section header level on download confirmation page for improved accessibility and consistency.

Author: Michał Gryczka

src/pages/download-confirm.astro

@@ -103,7 +103,7 @@ const tags = [
 
           <div class="newsletter-wrapper">
             <NewsletterSection
-              headerLevel="3"
+              headerLevel="2"
               title="Stay Updated on New Releases"
               description="Release notes and occasional news — no spam, just one email per month max."
             />