Open version page in new tab. (#518)

Change-Id: I88f452e2b7a4495c310d028bbc0777ccfdb1eeb1

Author: loongliu

theme/VersionIndicator.tsx

@@ -94,7 +94,7 @@ export function VersionIndicator() {
   };
 
   const viewAllVersions = () => {
-    window.location.href = `/next${langPrefix}/versions`;
+    window.open(`/next${langPrefix}/versions`, '_blank');
   };
 
   const displayVersion = versionJson.current_version;