Migrate from channel to phoenix live view.

Move phoenix config to ui project.
Sync progress on page load.

ui/lib/ui_web/live/morse_live.ex

@@ -0,0 +1,23 @@
+defmodule UiWeb.MorseLive do
+  use Phoenix.LiveView
+
+  @topic "morse_progress"
+
+  def render(assigns) do
+    UiWeb.PageView.render("morse.html", assigns)
+  end
+
+  def mount(_session, socket) do
+    UiWeb.Endpoint.subscribe(@topic)
+    {:ok, assign(socket, progress: Morse.Server.progress())}
+  end
+
+  def handle_event("start_morse", _value, socket) do
+    Morse.Server.start_morse()
+    {:noreply, socket}
+  end
+
+  def handle_info(progress, socket) do
+    {:noreply, assign(socket, progress: progress)}
+  end
+end