add deog-ki picture

Author: edbennett

_data/members.yml

@@ -18,6 +18,7 @@
   affiliation: Pusan National University
   affiliation-url: https://pusan.ac.kr/eng/Main.do
   github: deogki
+  image: deogki
   status: Core Members
   orcid: 0000-0002-3923-4184
   pronouns: he/him