feat(chat): simplify socket response

Add helper methods to create the tuples `{:ok, socket}` and
`{:noreply, socket}`, and make them available in `SlaxWeb` module.

lib/slax_web.ex

@@ -55,6 +55,8 @@ defmodule SlaxWeb do
       use Phoenix.LiveView,
         layout: {SlaxWeb.Layouts, :app}
 
+      import SlaxWeb.SocketHelpers, only: [ok: 1, noreply: 1]
+
       unquote(html_helpers())
     end
   end