fix: do not render <link rel=alternate on versioned API reference pages (#2292)

Checks the `docusaurus-plugin-typedoc-api` global data for available
versions and only adds the markdown alternate link to "current" latest
versions.

Check e.g. `lychee` check for 404 links on the `/next` pages in
`apify-client-js`
([link](https://github.com/apify/apify-client-js/actions/runs/22395917589#summary-64829405227))

<img width="1326" height="818" alt="image"
src="https://github.com/user-attachments/assets/29b79be0-7393-4fc6-925e-20929cfb8549"
/>

Author: barjin

apify-docs-theme/src/theme/Layout/index.jsx

@@ -12,9 +12,16 @@ export default function LayoutWrapper(props) {
     const baseUrl = useBaseUrl('/');
     const { pathname } = useLocation();
     const currentPath = pathname.replace(new RegExp(`^${baseUrl}`), '').trim();
-    const allDocsData = useAllDocsData();
-    const isVersionedPage = Object.values(allDocsData).some(
-        (pluginData) => pluginData.versions.some((version) => !version.isLast && pathname.startsWith(version.path)),
+    const docsPluginData = useAllDocsData();
+    const typedocPluginData = usePluginData('docusaurus-plugin-typedoc-api') ?? {};
+
+    const allPluginData = {
+        ...docsPluginData,
+        'typedoc-plugin-default': typedocPluginData,
+    };
+
+    const isVersionedPage = Object.values(allPluginData).some(
+        (pluginData) => pluginData.versions?.some((version) => !version.isLast && pathname.startsWith(version.path)),
     );
 
     const shouldRenderAlternateLink = currentPath && currentPath !== '404' && !isVersionedPage;