fix(docs-infra): removal of the use of the ChildNode.remove() method that it isn't supported by IE (#28188)

fixes #28177

PR Close #28188

aio/src/app/layout/doc-viewer/doc-viewer.component.ts

@@ -100,9 +100,10 @@ export class DocViewerComponent implements OnDestroy {
     if (needsToc && !embeddedToc) {
       // Add an embedded ToC if it's needed and there isn't one in the content already.
       titleEl!.insertAdjacentHTML('afterend', '<aio-toc class="embedded"></aio-toc>');
-    } else if (!needsToc && embeddedToc) {
+    } else if (!needsToc && embeddedToc && embeddedToc.parentNode !== null) {
       // Remove the embedded Toc if it's there and not needed.
-      embeddedToc.remove();
+      // We cannot use ChildNode.remove() because of IE11
+      embeddedToc.parentNode.removeChild(embeddedToc);
     }
 
     return () => {

aio/src/app/shared/toc.service.ts

@@ -68,7 +68,10 @@ export class TocService {
         }
       }
       // now remove the anchor
-      anchorLink.remove();
+      if (anchorLink.parentNode !== null) {
+        // We cannot use ChildNode.remove() because of IE11
+        anchorLink.parentNode.removeChild(anchorLink);
+      }
     }
     // security: the document element which provides this heading content
     // is always authored by the documentation team and is considered to be safe