Update overview image in about us section

Author: bendichter

content/about-us/_index.md

@@ -12,7 +12,7 @@ about_section:
     down the obstacles to data sharing.
 overview_section:
   enable: true
-  image: /images/overview.png
+  image: /images/nwb_triangle.png
   title: Overview
   content: The aim of Neurodata Without Borders is to standardize neuroscience
     data on an international scale. Our goal is to break down the geographic,