Update CORS origin for html pages

dev/docs/firebase.json

diff --git a/dev/docs/firebase.json b/dev/docs/firebase.json
index 0a76cd2..acedd66 100644
--- a/dev/docs/firebase.json
+++ b/dev/docs/firebase.json
@@ -16,6 +16,15 @@
             "value": "*"
           }
         ]
+      },
+      {
+        "source": "**/*.html",
+        "headers": [
+          {
+            "key": "Access-Control-Allow-Origin",
+            "value": "*"
+          }
+        ]
       }
     ]
   }