feat: enhance external link rendering

layouts/_default/_markup/render_link.html

@@ -0,0 +1,7 @@
+<a href="{{ .Destination | safeURL }}"
+{{ with .Title}} title="{{ . }}"{{ end }}
+{{ if strings.HasPrefix .Destination "http" }}
+    target="_blank" rel="external nofollow noopener noreferrer"
+{{ end }}>
+    {{ .Text | safeHTML }}
+</a>

layouts/partials/extend_head.html

@@ -0,0 +1,12 @@
+<script>
+    document.addEventListener('DOMContentLoaded', function () {
+        var links = document.getElementsByTagName("a");
+        var i;
+        for (i = 0; i < links.length; i++) {
+            if (location.hostname !== links[i].hostname) {
+                links[i].rel = "external nofollow noopener noreferrer";
+                links[i].target = "_blank";
+            }
+        }
+    });
+</script>