docs: support multiple sidebars in a project (#11768)

* changed to new sidebar across projects except resources

* finalize multi sidebar support

* clean up

* remove redundant property

* small changes

* fixes

* generate

* fix error

* fix initial open

www/apps/resources/app/troubleshooting/page.mdx

@@ -12,4 +12,4 @@ The following troubleshooting guides are intended for technical users. If you're
 
 </Note>
 
-<ChildDocs />
+<ChildDocs hideItems={["Overview"]} />