Updates Purdue image

- Updates the Purdue image to use their more square one
- Changes background color to a grey

Author: exoticDFT

_data/org-members.yaml

@@ -15,6 +15,6 @@ standard:
     date_joined: 2024-10-28
     founding_member: true
     tier: "Standard"
-    background: rgba(0.0, 0.0, 0.0, 1.0)
+    background: rgba(0, 0, 0, 0.7)
 
 premier: