Update banner description

Author: jgeldenbott

index.html

@@ -7,7 +7,7 @@
   <meta name="description" content="DESCRIPTION META TAG">
   <meta property="og:title" content="Legible and Proactive Robot Planning for Prosocial Human-Robot Interactions
 "/>
-  <meta property="og:description" content=""/>
+  <meta property="og:description" content="Toward building robots that can safely and seamlessly interact with humans, we propose a general robot trajectory planning framework for synthesizing legible and proactive behaviors and demonstrate that our robot planner naturally leads to prosocial interactions."/>
   <meta property="og:url" content="https://uw-ctrl.github.io/phri/"/>
   <!-- Path to banner image, should be in the path listed below. Optimal dimenssions are 1200X630-->
   <meta property="og:image" content="static/image/your_banner_image.png" />