docs: update default route description

guides/get_started/installation.md

@@ -325,9 +325,27 @@ end
 
 This macro will add the required routes for the `PostLive` module. You can now access the `PostLive` LiveResource at `/admin/posts`.
 
-> Hint: To configure a default redirect route for `/admin` we recommend to create a redirect controller like the following:
+### Configure a default route
 
-In your `router.ex` file:
+To make a default route for `/admin` we recommend creating a redirect controller such as the following:
+
+In `my_app_web/controller` create a file named `redirect_controller.ex`:
+
+```elixir
+# redirect_controller.ex
+
+defmodule MyAppWeb.RedirectController do
+  use MyAppWeb, :controller
+
+  def redirect_to_posts(conn, _params) do
+    conn
+    |> Phoenix.Controller.redirect(to: ~p"/admin/posts")
+    |> Plug.Conn.halt()
+  end
+end
+```
+
+And configure in your `router.ex` file:
 
 ```elixir
 #router.ex
@@ -339,30 +357,14 @@ scope "/admin", MyAppWeb do
   backpex_routes()
 
   get "/", RedirectController, :redirect_to_posts
-  
+
   live_session :default, on_mount: Backpex.InitAssigns do
     # add this line
     live_resources "/posts", PostLive
   end
 end
 ```
 
-And in `my_app_web/controller` create a file named `redirect_controller.ex`:
-
-```elixir
-# redirect_controller.ex
-
-defmodule MyAppWeb.RedirectController do
-  use MyAppWeb, :controller
-
-  def redirect_to_posts(conn, _params) do
-    conn
-    |> Phoenix.Controller.redirect(to: ~p"/admin/posts")
-    |> Plug.Conn.halt()
-  end
-end
-```
-
 ## Remove default background color
 
 If you start with a new Phoenix project, you may have a default background color set for your body tag. This conflicts with the background color of the Backpex `app_shell`.