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/packages/docs-ui/src/utils/index.ts

@@ -12,6 +12,6 @@ export * from "./is-elm-window"
 export * from "./is-in-view"
 export * from "./learning-paths"
 export * from "./set-obj-value"
-export * from "./sidebar-attach-href-common-options"
+export * from "./sidebar-utils"
 export * from "./swr-fetcher"
 export * from "./workflow-diagram-utils"