Improve website content and fix navigation issues

Update website meta tags, SEO information, and fix a banner overlay bug to ensure all interactive elements are clickable.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 23852c00-4779-460a-9e0c-d09fee4b6c92
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: 60ed045f-57e0-4c65-bc71-4205e0064bbb
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/f209e72a-0939-48fa-84fc-57854de71967/23852c00-4779-460a-9e0c-d09fee4b6c92/aNXfGlM
Replit-Helium-Checkpoint-Created: true

client/src/components/header.tsx

@@ -45,7 +45,7 @@ export default function Header() {
         <div className="flex items-center justify-between gap-4 h-16">
           <Link href="/">
             <div className="flex items-center gap-2 cursor-pointer" data-testid="link-logo">
-              <img src={folxLogo} alt="Folx TV" className="h-32 w-auto object-contain py-1" />
+              <img src={folxLogo} alt="FOLX TV – Volksmusik & Schlager Fernsehsender" className="h-32 w-auto object-contain py-1" />
             </div>
           </Link>