fix: add index and reference docs to manual sidebar

Author: Kristopher Turner

sidebars.js

@@ -16,13 +16,15 @@
  */
 const sidebars = {
   sidebar: [
+    { type: 'doc', id: 'index' },
     { type: 'autogenerated', dirName: 'planning' },
     { type: 'autogenerated', dirName: 'design' },
     { type: 'autogenerated', dirName: 'implementation' },
     { type: 'autogenerated', dirName: 'automation' },
     { type: 'autogenerated', dirName: 'operations' },
     { type: 'autogenerated', dirName: 'azure-services' },
     { type: 'autogenerated', dirName: 'lab-environment' },
+    { type: 'doc', id: 'reference' },
     { type: 'autogenerated', dirName: 'standards' },
     {
       type: 'link',