Add the hot.jar cdn link to index.html file (#204)

index.html

@@ -15,6 +15,17 @@
 
       gtag('config', 'UA-167873271-3');
     </script>
+    <!-- Hotjar Tracking Code for ScholarX V2 -->
+    <script>
+        (function(h,o,t,j,a,r){
+            h.hj=h.hj||function(){(h.hj.q=h.hj.q||[]).push(arguments)};
+            h._hjSettings={hjid:5160281,hjsv:6};
+            a=o.getElementsByTagName('head')[0];
+            r=o.createElement('script');r.async=1;
+            r.src=t+h._hjSettings.hjid+j+h._hjSettings.hjsv;
+            a.appendChild(r);
+        })(window,document,'https://static.hotjar.com/c/hotjar-','.js?sv=');
+    </script>
     <meta charset="UTF-8" />
     <meta
       name="viewport"