Fix structured data product warning

index.html

@@ -87,34 +87,12 @@
         "priceRange": "€€",
         "currenciesAccepted": "EUR",
         "paymentAccepted": "Cash, EC-Karte",
-        "hasOfferCatalog": {
+        "knowsAbout": [
-            "@type": "OfferCatalog",
+            "Allgäuer Bio-Heumilchkäse",
-            "name": "Feinkost-Sortiment",
+            "Bodensee-Weine",
-            "itemListElement": [
+            "Bio-Kaffee"
-                {
-                    "@type": "Offer",
-                    "itemOffered": {
-                        "@type": "Product",
-                        "name": "Allgäuer Bio-Heumilchkäse"
-                    }
-                },
-                {
-                    "@type": "Offer",
-                    "itemOffered": {
-                        "@type": "Product",
-                        "name": "Bodensee-Weine"
-                    }
-                },
-                {
-                    "@type": "Offer",
-                    "itemOffered": {
-                        "@type": "Product",
-                        "name": "Bio-Kaffee"
-                    }
-                }
         ]
     }
-    }
     </script>
     <!-- Top Bar -->
     <div class="top-bar">