fix: restore Training to left sidebar as external link to subsite

Author: Kristopher Turner

sidebars.js

@@ -15,8 +15,14 @@
  @type {import('@docusaurus/plugin-content-docs').SidebarsConfig}
  */
 const sidebars = {
-  // By default, Docusaurus generates a sidebar from the docs folder structure
-  sidebar: [{ type: 'autogenerated', dirName: '.' }],
+  sidebar: [
+    { type: 'autogenerated', dirName: '.' },
+    {
+      type: 'link',
+      label: 'Training',
+      href: 'https://azurelocal.cloud/azurelocal-training/',
+    },
+  ],
 
   // But you can create a sidebar manually
   /*