fix spread operator on external links

Author: hugur

gatsby-theme-w3f/src/components/default/Link.js

@@ -5,7 +5,7 @@ const Link = ({ to, title, children, ...other }) => {
   const external = testExternalLink(to);
   if (external) {
     return (
-      <a href={to} title={title} target="_blank" rel="noreferrer noopener">
+      <a href={to} title={title} target="_blank" rel="noreferrer noopener" {...other}>
         {children}
       </a>
     );