Updated photos and reduced some jpg quality to get a more reasonable file size

Author: thetianshuhuang

_team/johnchoi.md _alumni/johnchoi.md_team/johnchoi.md renamed to _alumni/johnchoi.md

@@ -4,5 +4,5 @@ lastname: "Miller"
 priority: 4 
 title: "PhD Candidate"
 affiliation: "Electrical and Computer Engineering Department"
-image: ""
+image: /img/team/john.jpg
 ---