Remove more extra code

lib/birdy_chat/application.ex

@@ -10,8 +10,6 @@ defmodule BirdyChat.Application do
     children = [
       BirdyChatWeb.Telemetry,
       BirdyChat.Identity,
-      BirdyChat.PeerSupervisor,
-      {Registry, keys: :unique, name: BirdyChat.PeerRegistry},
       {DNSCluster, query: Application.get_env(:birdy_chat, :dns_cluster_query) || :ignore},
       {Phoenix.PubSub, name: BirdyChat.PubSub},
       # Start a worker by calling: BirdyChat.Worker.start_link(arg)

lib/birdy_chat/peer_client.ex

@@ -1,9 +0,0 @@
-defmodule BirdyChat.PeerClient do
-  use Slipstream, restart: :temporary
-
-  def start_link(args) do
-    name = args[:peer_name]
-    name = {:via, BirdyChat.PeerRegistry, {:peers, name}}
-    Slipstream.start_link(__MODULE__, args, name: name)
-  end
-end

lib/birdy_chat/peer_supervisor.ex

@@ -1,17 +0,0 @@
-defmodule BirdyChat.PeerSupervisor do
-  use DynamicSupervisor
-
-  def start_link(init_arg) do
-    DynamicSupervisor.start_link(__MODULE__, init_arg, name: __MODULE__)
-  end
-
-  def start_child(peer_name, peer_address) do
-    spec = {BirdyChat.PeerClient, peer_name: peer_name, peer_address: peer_address}
-    DynamicSupervisor.start_child(__MODULE__, spec)
-  end
-
-  @impl true
-  def init(init_arg) do
-    DynamicSupervisor.init(strategy: :one_for_one, extra_arguments: [init_arg])
-  end
-end