feat: add certification thing

test/resources/indexable/Book.4.json

@@ -5,9 +5,7 @@
     "uid": "f6ee5744-a441-595d-9dae-a9f579c0660f",
     "name": "Kant",
     "description": "176 S.",
-    "categories": [
-      "book"
-    ],
+    "categories": ["book"],
     "authors": [
       {
         "uid": "7e198ecf-966a-5f99-8a45-266243583023",
@@ -20,17 +18,13 @@
       {
         "uid": "6333427c-0725-5398-9a04-11604680dae3",
         "type": "publication event",
-        "locations": [
-          "Paris"
-        ],
+        "locations": ["Paris"],
         "publisher": "Belles Lettres",
         "name": "Belles Lettres"
       }
     ],
     "sameAs": "https://ubffm.hds.hebis.de/Record/HEB102248788",
-    "ISBNs": [
-      "2251760385"
-    ],
+    "ISBNs": ["2251760385"],
     "origin": {
       "indexed": "2018-09-11T12:30:00Z",
       "name": "HeBIS HDS",