Add a dropdown on participate menu, disallow listing participations

Now requires quering the person endpoint to know if an actor
participates in an event, organizers can make authenticated requests to
event { participants { } } to see the pending / approved participants.

Also closes #174

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

lib/mobilizon_web/schema/events/participant.ex

@@ -44,16 +44,6 @@ defmodule MobilizonWeb.Schema.Events.ParticipantType do
     field(:actor, :deleted_object)
   end
 
-  object :participant_queries do
-    @desc "Get all participants for an event uuid"
-    field :participants, list_of(:participant) do
-      arg(:uuid, non_null(:uuid))
-      arg(:page, :integer, default_value: 1)
-      arg(:limit, :integer, default_value: 10)
-      resolve(&Resolvers.Event.list_participants_for_event/3)
-    end
-  end
-
   object :participant_mutations do
     @desc "Join an event"
     field :join_event, :participant do