Introduce relay

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

test/mobilizon/service/activity_pub/relay_test.exs

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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Mobilizon.Service.ActivityPub.RelayTest do
+  use Mobilizon.DataCase
+
+  alias Mobilizon.Service.ActivityPub.Relay
+
+  test "gets an actor for the relay" do
+    actor = Relay.get_actor()
+
+    assert actor.url =~ "/relay"
+  end
+end