don't include the config callback yet

lib/fun_with_flags.ex

@@ -8,9 +8,4 @@ defmodule FunWithFlags do
   """
 
   use FunWithFlags.EntryPoint
-
-  @impl true
-  def config do
-    {:ok, []}
-  end
 end

lib/fun_with_flags/entry_point.ex

@@ -543,12 +543,4 @@ defmodule FunWithFlags.EntryPoint do
 
     end
   end
-
-  @doc """
-  An entry point must define this callback to provide its configuration.
-
-  This function is supposed to retrieve any runtime config (e.g. ENV vars) and
-  return it as a keyword list.
-  """
-  @callback config() :: {:ok, Keyword.t()}
 end