ads: remove duplicate 728x90 from author page (Footer banner remains)

src/app/authors/[slug]/page.tsx

@@ -431,15 +431,6 @@ export default function AuthorProfilePage() {
           )}
         </div>
 
-        {/* In-content 728x90 banner */}
-        {ADS_728X90.length > 0 && (
-          <div
-            className="max-w-container mx-auto px-4 mt-10 hidden md:flex justify-center"
-            aria-label="Advertisement"
-          >
-            <AdImage ad={shuffle(ADS_728X90)[0]} page="authors" />
-          </div>
-        )}
       </main>
       <Footer />
     </>