only show instance config link for permitted users, make nav markup

component async

src/web/pages/users/create.rs

@@ -36,7 +36,7 @@ pub async fn page(
     Ok(base(
         "Create User | Mnemosyne",
         html!(
-            (nav(Some(&u), req.uri().path()))
+            (nav(&mut conn, Some(&u), req.uri().path()).await)
 
             div class="mx-auto max-w-4xl px-2 my-4" {
                 p class="flex items-center gap-2" {