Update about.html to reflect current JCB members and affiliations (#769)

Author: marthacryan

about.html

@@ -388,7 +388,7 @@
     subproject: Jupyter Widgets
   - name: Martha Cryan
     photo: Martha_Cryan.jpg
-    affiliation: Mito
+    affiliation: Plotly
     gh_handle: marthacryan
     linkedin: https://www.linkedin.com/in/marthacryan/
     subproject: DEI Working Group  
@@ -473,7 +473,7 @@
 - name: Martha Cryan
   photo: Martha_Cryan.jpg
   gh_handle: marthacryan
-  affiliation: Mito
+  affiliation: Plotly
 - name: Jason Grout
   photo: JasonGrout.jpeg
   affiliation: Databricks
@@ -483,13 +483,6 @@
   photo: Ana_Ruvalcaba.jpg
   affiliation: Cal Poly, San Luis Obispo
   gh_handle: ruv7
-- name: Rollin Thomas
-  photo: Rollin_Thomas.jpg
-  linkedin: https://www.linkedin.com/in/rollin-thomas-507185b5/
-  personal: https://www.nersc.gov/about/nersc-staff/programming-environments-and-models/rollin-thomas/
-  gh_handle: rcthomas
-  twitter_handle: r_c_thomas
-  affiliation: Berkeley Lab
 
 sponsor_box:
   headline: Sponsors