Add Zach Sailer to Executive Council Page (#758)

Author: Zsailer

about.html

@@ -351,10 +351,11 @@
     photo: Ana_Ruvalcaba.jpg
     affiliation: Cal Poly, San Luis Obispo
     gh_handle: ruv7
-  - name: Steven Silvester
-    photo: StevenSilvester.jpeg
-    affiliation: MongoDB
-    gh_handle: blink1073
+  - name: Zach Sailer
+    photo: Zach_Sailer.jpg
+    gh_handle: Zsailer
+    affiliation: Apple
+    linkedin: https://linkedin.com/in/zach-sailer-8a1472151/
 
 software_steering_council:
   - name: Sylvain Corlay
@@ -400,13 +401,6 @@
     affiliation: Simula Research Lab
     gh_handle: minrk
     subproject: JupyterHub and Binder
-  - name: Zach Sailer
-    photo: Zach_Sailer.jpg
-    gh_handle: Zsailer
-    affiliation: Apple
-    linkedin: https://linkedin.com/in/zach-sailer-8a1472151/
-    twitter_handle: zrsailer
-    subproject: Jupyter Server
   - name: Jeremy Tuloup
     affiliation: QuantStack
     photo: Jeremy_Tuloup.png