Update Prismic detection, fix JSON schema

schema.json

@@ -238,7 +238,17 @@
         "$ref": "#/definitions/non-empty-non-blank-string"
       },
       "xhr": {
-        "$ref": "#/definitions/non-empty-non-blank-string"
+        "oneOf": [
+          {
+            "type": "array",
+            "items": {
+              "$ref": "#/definitions/non-empty-non-blank-string"
+            }
+          },
+          {
+            "$ref": "#/definitions/non-empty-non-blank-string"
+          }
+        ]
       }
     }
   }

src/technologies/p.json

@@ -1338,6 +1338,7 @@
     ],
     "description": "Prismic is a headless CMS for Jamstack.",
     "icon": "Prismic.svg",
+    "dom": "img[src*='images.prismic.io'",
     "pricing": [
       "low",
       "freemium",
@@ -1833,4 +1834,4 @@
     },
     "website": "http://punbb.informer.com"
   }
-}
+}