changed Bella Pequette details to people data

Author: bellapequette

_data/people.yml

@@ -209,7 +209,7 @@
       name: Github
 
 - name: Bella Pequette
-  pic: /img/people/pequetteb.jpg
+  pic: /img/people/pequetteb.jpeg
   dates: 2024-Present
   role: Undergraduate Research Assistant
   description: 'Bella is an undergraduate in NPRE, interested in spent fuel management practices such as fuel reprocessing and simulating the nuclear fuel cycle.'