feat: add certification thing

test/resources/indexable/Dish.1.json

@@ -3,9 +3,7 @@
   "instance": {
     "type": "dish",
     "name": "Pizza mit Geflügelsalami und Champignons",
-    "categories": [
-      "main dish"
-    ],
+    "categories": ["main dish"],
     "characteristics": [],
     "additives": [
       "konserviert",
@@ -38,21 +36,14 @@
           "geo": {
             "point": {
               "type": "Point",
-              "coordinates": [
-                13.32612,
-                52.50978
-              ]
+              "coordinates": [13.32612, 52.50978]
             }
           },
           "type": "building",
-          "categories": [
-            "restaurant"
-          ],
+          "categories": ["restaurant"],
           "openingHours": "Mo-Fr 11:00-14:30",
           "name": "TU-Mensa",
-          "alternateNames": [
-            "MensaHardenberg"
-          ],
+          "alternateNames": ["MensaHardenberg"],
           "uid": "72fbc8a3-ebd1-58f9-9526-ad65cba2e402",
           "address": {
             "addressCountry": "Germany",