docs: handle Card and CardList components in cross-links plugin (#7338)

www/packages/remark-rehype-plugins/src/utils/get-attribute.ts

@@ -0,0 +1,20 @@
+import { UnistNodeWithData } from "../types/index.js"
+
+export default function getAttribute(
+  node: UnistNodeWithData,
+  attrName: string
+) {
+  const attributeIndex = node.attributes?.findIndex(
+    (attribute) => attribute.name === attrName
+  )
+  if (attributeIndex === undefined || attributeIndex === -1) {
+    return
+  }
+  const attribute = node.attributes![attributeIndex]
+
+  if (!attribute) {
+    return
+  }
+
+  return attribute
+}