fix: dont open relative links in a new tab

Author: jerelmiller

plugins/remark-external-link-icon/index.js

@@ -3,7 +3,9 @@ const visit = require('unist-util-visit');
 const remarkExternalLinks = () => (tree) => {
   const isTarget = (node) => {
     return (
-      node.type === 'link' && node.url.indexOf('opensource.newrelic.com') < 0
+      node.type === 'link' &&
+      node.url.indexOf('opensource.newrelic.com') < 0 &&
+      !node.url.startsWith('/')
     );
   };