docs: generate sidebar for main docs (#11139)

www/apps/book/scripts/prepare.mjs

@@ -1,7 +1,11 @@
-import { generateEditedDates } from "build-scripts"
+import { sidebar } from "../sidebar.mjs"
+import { generateEditedDates, generateSidebar } from "build-scripts"
 
 async function main() {
   await generateEditedDates()
+  await generateSidebar(sidebar, {
+    addNumbering: true,
+  })
 }
 
 void main()