feat(docs): add resources admonition with external links (#36761)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

docs/src/theme/Admonition/Types.js

@@ -0,0 +1,63 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import React from 'react';
+import DefaultAdmonitionTypes from '@theme-original/Admonition/Types';
+
+function ResourcesIcon() {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="16"
+      height="16"
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      strokeWidth="2"
+      strokeLinecap="round"
+      strokeLinejoin="round"
+    >
+      {/* Bookmark/link icon */}
+      <path d="M19 21l-7-5-7 5V5a2 2 0 0 1 2-2h10a2 2 0 0 1 2 2z" />
+    </svg>
+  );
+}
+
+function ResourcesAdmonition(props) {
+  return (
+    <div className="admonition admonition-resources alert alert--resources">
+      <div className="admonition-heading">
+        <h5>
+          <span className="admonition-icon">
+            <ResourcesIcon />
+          </span>
+          {props.title || 'Additional Resources'}
+        </h5>
+      </div>
+      <div className="admonition-content">{props.children}</div>
+    </div>
+  );
+}
+
+const AdmonitionTypes = {
+  ...DefaultAdmonitionTypes,
+  resources: ResourcesAdmonition,
+};
+
+export default AdmonitionTypes;