add placeholder admin page

lib/cms_web/components/layouts/admin.html.heex

@@ -0,0 +1,17 @@
+<div class="flex flex-row py-1 px-3 mb-2 border-b border-slate-100">
+  admin mode
+</div>
+<div class="flex flex-col md:flex-row mx-auto max-w-3xl">
+  <section class="flex flex-col p-2 gap-y-1 border-slate-100 border-b md:border-b-0">
+    <.link navigate={~p"/"} class="font-bold hover:underline">sloanelybutsurely.com</.link>
+    <nav>
+      <ul>
+        <li><.link navigate={~p"/writing"} class="hover:underline">writing</.link></li>
+        <li><.link navigate={~p"/microblog"} class="hover:underline">microblog</.link></li>
+      </ul>
+    </nav>
+  </section>
+  <main class="p-2">
+    {@inner_content}
+  </main>
+</div>

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

@@ -8,7 +8,7 @@
       </ul>
     </nav>
   </section>
-  <main>
+  <main class="p-2">
     {@inner_content}
   </main>
 </div>

lib/cms_web/live/admin_live.ex

@@ -0,0 +1,15 @@
+defmodule CMSWeb.AdminLive do
+  use CMSWeb, :live_view
+
+  @impl true
+  def mount(_params, _session, socket) do
+    {:ok, socket}
+  end
+
+  @impl true
+  def render(assigns) do
+    ~H"""
+    <h1>AdminLive</h1>
+    """
+  end
+end

lib/cms_web/router.ex

@@ -1,4 +1,5 @@
 defmodule CMSWeb.Router do
+  alias CMSWeb.Layouts
   use CMSWeb, :router
 
   pipeline :browser do
@@ -22,6 +23,14 @@ defmodule CMSWeb.Router do
     get "/microblog", PageController, :microblog
   end
 
+  live_session :admin, layout: {Layouts, :admin} do
+    scope "/admin", CMSWeb do
+      pipe_through :browser
+
+      live "/", AdminLive
+    end
+  end
+
   # Other scopes may use custom stacks.
   # scope "/api", CMSWeb do
   #   pipe_through :api