Update Navbar partial to show the Server menu item for moderators.

lib/decentralised_book_index_web/components/my_partials/navbar.ex

@@ -106,7 +106,7 @@ defmodule DecentralisedBookIndexWeb.Components.MyPartials.Navbar do
                 </a>
               </li>
             <% end %>
-            <%= if @current_user != nil and Role.can_administrate?(@current_user.role) do %>
+            <%= if @current_user != nil and Role.can_moderate?(@current_user.role) do %>
               <li>
                 <a
                   href={~p"/servers/"}