fix filename

Author: SethTisue

_data/ambassadors.yml

@@ -78,7 +78,7 @@
 
 - name: Zainab Ali
   description: London Scala User Group organizer, conference speaker, open source contributor and maintainer
-  image: /ambassadors/zainab.png
+  image: /ambassadors/zainab.jpg
   city: London, England
   discord: zainabali
   github: zainab-ali