Update the excerpt

Author: dpiparo

index.html

@@ -2,7 +2,7 @@
 layout: splash
 title: "ROOT: analyzing petabytes of data, scientifically."
 author_profile: false
-excerpt: "An open-source data analysis framework used by [high energy physics](https://en.wikipedia.org/wiki/Particle_physics) and others."
+excerpt: "ROOT: analyzing petabytes of data, scientifically."
 header:
   og_image: /assets/images/ROOT-image-share.png
   overlay_image: /assets/images/splash_optimized.jpg