fix nick pfp

Author: joahg

_meetups/2024-08-20-meetup.md

@@ -6,7 +6,7 @@ video:
 speakers:
   - name: Nicholas Mullen
     title:
-    avatar: https://media.licdn.com/dms/image/C4E03AQECCXly0QRYRA/profile-displayphoto-shrink_800_800/0/1557285132677?e=1724284800&v=beta&t=4YueTBmzvHkIY-egkkpM3xNzpqBLMABHpDUDjXvDLFA
+    avatar: https://avatars.githubusercontent.com/u/112715?v=4
     bio: Nicholas is visiting us from Richmond Va, and if we're nice enough he might stay longer. He is a Software Engineer at GiveCampus where he does full-stack dev work with Ruby, Rails, Javascript, and React.
     email: nwmullen@gmail.com
     homepage: