add hiking group photo

Author: kupsch

petascale2024/assets/images/hiking_group_photo.jpg

@@ -14,3 +14,6 @@ and will then break up into working groups to tackle real technical problems
 for the second half of the workshop.
 
 On Sunday evening, the welcome reception starts at 5:30pm and dinner at 6:30pm.
+
+<img src="assets/images/hiking_group_photo.jpg" style="width:100%; height:auto; max-width:100%; border:solid">
+