Enable insights for Algolia DocSearch (#1015)

Author: josh-wong

docusaurus.config.js

@@ -392,6 +392,8 @@ const config = {
         // Optional: see doc section below
         contextualSearch: true,
 
+        insights: true,
+
         // Optional: Specify domains where the navigation should occur through window.location instead on history.push. Useful when our Algolia config crawls multiple documentation sites and we want to navigate with window.location.href to them.
         // externalUrlRegex: 'external\\.com|domain\\.com',