refactor(content-docs): refactor sidebars, Joi validation, generator rework, expose config types (#5678)

packages/create-docusaurus/templates/shared/sidebars.js

@@ -9,7 +9,10 @@
  Create as many sidebars as you want.
  */
 
-module.exports = {
+// @ts-check
+
+/** @type {import('@docusaurus/plugin-content-docs').SidebarsConfig} */
+const sidebars = {
   // By default, Docusaurus generates a sidebar from the docs folder structure
   tutorialSidebar: [{type: 'autogenerated', dirName: '.'}],
 
@@ -24,3 +27,5 @@ module.exports = {
   ],
    */
 };
+
+module.exports = sidebars;