Update Rick Wagner bio with pic and affiliation

Author: rpwagner

about.html

@@ -353,7 +353,9 @@
     twitter_handle: zrsailer
     subproject: Jupyter Server
   - name: Rick Wagner
-    photo: placeholder.png
+    photo: RickWagner.png
+    affiliation: UC San Diego
+    linkedin: https://www.linkedin.com/in/rpwagner
     gh_handle: rpwagner
     subproject: Jupyter Security
   - name: Carol Willing