Fix #3063 - Add dynamic app manifest (#3563)

* Fix #3063 - Add dynamic app manifest

* Added short_name

* Add background_color

app/controllers/manifests_controller.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class ManifestsController < ApplicationController
+  before_action :set_instance_presenter
+
+  def show; end
+
+  def set_instance_presenter
+    @instance_presenter = InstancePresenter.new
+  end
+end