fix: open universal nav links on the same tab (#38273)

client/src/components/helpers/Link.js

@@ -5,16 +5,23 @@ import { Link as GatsbyLink } from 'gatsby';
 const propTypes = {
   children: PropTypes.any,
   external: PropTypes.bool,
+  sameTab: PropTypes.bool,
   to: PropTypes.string.isRequired
 };
 
-const Link = ({ children, to, external, ...other }) => {
+const Link = ({ children, to, external, sameTab, ...other }) => {
   if (!external && /^\/(?!\/)/.test(to)) {
     return (
       <GatsbyLink to={to} {...other}>
         {children}
       </GatsbyLink>
     );
+  } else if (sameTab && external) {
+    return (
+      <a href={to} {...other}>
+        {children}
+      </a>
+    );
   }
 
   return (