add video metadata

Author: arpitnarechania

index.html

@@ -41,7 +41,7 @@
         content="Exploropleth: Exploratory Analysis of Data Binning Methods in Choropleth Maps">
     <meta property="og:image"
         content="https://raw.githubusercontent.com/exploropleth/exploropleth.github.io/main/assets/images/overview.png">
-    <!--<meta property="og:video" content="">-->
+    <meta property="og:video" content="https://youtu.be/lNV8VL0owqU">
 
     <!-- Twitter -->
     <meta property="twitter:card" content="summary_large_image">