Watch DOM changes to add external link icons to new external links

src/assets/views/scripts/ExternalLinkIcons.svelte

@@ -11,6 +11,7 @@
 
         document.querySelectorAll('a[target="_blank"]').forEach(el => {
             if (!el.classList.contains('no-icon')) {
+                el.classList.add('no-icon');
                 el.appendChild(iconElement.cloneNode(true));
             }
         });
@@ -18,6 +19,13 @@
 
     onMount(() => {
         addExternalLinkIcons();
+
+        new MutationObserver(() => {
+            addExternalLinkIcons();
+        }).observe(document.body, {
+            childList: true,
+            subtree: true,
+        });
     });
 </script>