Temporary fix for website book broken navigation (#661)

* Reproduce without "content::Content()"

* move cached_sidebar_data area.

* cargo clippy

* cargo clippy

* cargo clippy

website/src/main.rs

@@ -67,16 +67,13 @@ async fn get_sidebar(version: Option<&str>) -> SidebarData {
 fn switch<G: Html>(route: ReadSignal<Routes>) -> View<G> {
     let cached_sidebar_data = create_signal(None::<(Option<String>, SidebarData)>);
     provide_context(cached_sidebar_data);
+    if cached_sidebar_data.with(|x| x.is_none() || x.as_ref().unwrap().0.is_some()) {
+        spawn_local_scoped(async move {
+            cached_sidebar_data.set(Some((None, get_sidebar(None).await)));
+        });
+    }
 
-    let fetch_docs_data = move |url| {
-        let data = create_resource(docs_preload(url));
-        if cached_sidebar_data.with(|x| x.is_none() || x.as_ref().unwrap().0.is_some()) {
-            spawn_local_scoped(async move {
-                cached_sidebar_data.set(Some((None, get_sidebar(None).await)));
-            });
-        }
-        data
-    };
+    let fetch_docs_data = move |url| create_resource(docs_preload(url));
     let view = create_memo(on(route, move || match route.get_clone() {
         Routes::Index => view! {
             div(class="container mx-auto") {