Adjust according to NN's comments

Author: GZHoffie

_authors/a-alkaff-ahamed.md

@@ -1,7 +1,7 @@
 ---
 username: ivan-sovic
 name: Ivan Sović
-position: Intern
-is_intern: true
+position: Graduate Student
+is_alumni: true
 image: '/images/members/old_website/Ivan_Sovic.png'
 ---