Update members.yml (#1555)

Author: xukai92

docs/_data/members.yml

@@ -12,7 +12,7 @@
   email: [email protected]
 
 - name: Kai Xu
-  photo: https://xuk.ai/assets/me_ne2x.png
+  photo: https://xukai92.github.io/assets/profile.png
   github: xukai92
   institution: University of Edinburgh
   website: https://xuk.ai/