Remove share box text

Remove the phrase "Help others discover this learning experience" from all share boxes.

src/components/SocialShare.tsx

@@ -122,7 +122,6 @@ const SocialShare: React.FC<SocialShareProps> = ({
       <div className="flex flex-col sm:flex-row items-center justify-between gap-4">
         <div className="text-center sm:text-left">
           <h3 className="text-lg font-semibold text-foreground">Share this interactive</h3>
-          <p className="text-sm text-muted-foreground">Help others discover this learning experience</p>
         </div>
         
         <div className="flex items-center gap-2">