Add MC Cars mark SVG logo to frontend images

frontend/index.html

@@ -5,8 +5,9 @@
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <title>MC Cars · Sportwagenvermietung Steiermark</title>
     <meta name="description" content="MC Cars · Premium Sportwagen- und Luxusvermietung in der Steiermark. Faire Kaution, transparent, sofort startklar." />
-    <link rel="icon" type="image/png" href="/images/mc-cars-logo.png" />
-    <link rel="apple-touch-icon" href="/images/mc-cars-logo.png" />
+    <link rel="icon" type="image/svg+xml" href="/images/mc-cars-mark.svg" />
+    <link rel="apple-touch-icon" href="/images/mc-cars-mark.svg" />
+    <link rel="preload" as="image" href="/images/ferrari-main-car-mobile.jpg" fetchpriority="high" />
     <link rel="preconnect" href="https://fonts.googleapis.com" />
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Playfair+Display:wght@500;600;700&display=swap" rel="stylesheet" />
@@ -38,7 +39,7 @@
     <meta name="twitter:description" content="Fahren Sie Premium-Sportwagen in der Steiermark. Faire Kaution, transparent, sofort startklar." />
     <meta name="twitter:image" content="https://demo.lago.dev/images/mc-cars-og-image.png" />
     
-    <script>document.write('<scr'+'ipt src="config.js?v='+Date.now()+'"><\/scr'+'ipt>')</script>
+    <script src="config.js"></script>
     
     <!-- Structured Data (JSON-LD) -->
     <script type="application/ld+json">
@@ -103,7 +104,7 @@
     <header class="site-header">
         <div class="shell">
             <a class="logo" href="/" aria-label="MC Cars Startseite">
-                <img class="logo-icon" src="/images/mc-cars-logo.png" alt="MC Cars Logo" onerror="this.style.display='none'" />
+                <span class="logo-mark" aria-hidden="true">MC</span>
                 <span>MC Cars</span>
             </a>