added sage flow figure to overview

docs/about/overview.md

@@ -16,6 +16,8 @@ Partners are deploying testbeds in Australia, Japan, UK, and Taiwan, providing s
 
 The data from sensors and applications is hosted in the cloud to facilitate easy data analysis.
 
+![High level overview of Sage](./images/sage-flow.png)
+
 ## Who are the users?
 
 The most common users have included:
@@ -25,7 +27,6 @@ The most common users have included:
 - Cyberinfrastructure researchers interested in platform research.
 - Domain scientists interested in adding new sensors and deploying nodes to answer specific science questions.
 
-
 ## How do I use the platform?
 
 This depends on your desired interaction interest.  The platform consists of edge compute applications which process data (ex. sensor readings, camera images, audio recordings, etc). These edge applications then produce their own data (ex. inferences) and upload the results to a cloud database. This cloud database can be accessed directly and/or additional compute can be performed on the cloud data.