Add musicBrainzUrl property to artiste and parole

src/api/artiste/content-types/artiste/schema.json

@@ -54,6 +54,9 @@
       "allowedTypes": [
         "images"
       ]
+    },
+    "musicBrainzUrl": {
+      "type": "string"
     }
   }
 }

src/api/parole/content-types/parole/schema.json

@@ -93,6 +93,9 @@
     },
     "gadeEmbed": {
       "type": "string"
+    },
+    "musicBrainzUrl": {
+      "type": "string"
     }
   }
 }