Add links for Publisher and Servers to navbar if user is signed in.

lib/decentralised_book_index_web/components/layouts/app.html.heex

@@ -1,5 +1,8 @@
 <header>
-  <.partial_navbar page_title={assigns[:page_title]} />
+  <.partial_navbar
+    page_title={assigns[:page_title]}
+    current_user={assigns[:current_user]}
+  />
 </header>
 
 <main class="px-4 pt-20 pb-2 sm:px-6 lg:px-8">

lib/decentralised_book_index_web/components/my_partials/navbar.ex

@@ -3,7 +3,8 @@ defmodule DecentralisedBookIndexWeb.Components.MyPartials.Navbar do
   use DecentralisedBookIndexWeb, :verified_routes
   alias Phoenix.LiveView.JS
 
-  attr(:page_title, :string, required: true)
+  attr :page_title, :string, required: true
+  attr :current_user, :map, default: nil
 
   def partial_navbar(assigns) do
     ~H"""
@@ -32,6 +33,14 @@ defmodule DecentralisedBookIndexWeb.Components.MyPartials.Navbar do
                     <li>
                         <a href={~p"/authors/"} class={selected_navbar_link_css(@page_title, "Listing Authors")} aria-current="page">Authors</a>
                     </li>
+                    <%= if @current_user != nil do %>
+                        <li>
+                            <a href={~p"/publishers/"} class={selected_navbar_link_css(@page_title, "Listing Publishers")} aria-current="page">Publishers</a>
+                        </li>
+                        <li>
+                            <a href={~p"/servers/"} class={selected_navbar_link_css(@page_title, "Listing Server")} aria-current="page">Servers</a>
+                        </li>
+                    <% end %>
                 </ul>
             </div>
         </div>