Remove auth requirement for storage uploads

storage.rules

@@ -4,7 +4,8 @@ service firebase.storage {
   match /b/{bucket}/o {
     match /{allPaths=**} {
       allow read;
-      allow write: if request.auth != null && request.resource.size <= 10 * 1024 * 1024; // 10MB
+      // Don't require auth, as dream uploads can be done by anyone
+      allow write: if request.resource.size <= 10 * 1024 * 1024; // 10MB
     }
   }
 }