[documentation] add custom favicon
[documentation] add custom favicon

Tisseo/navitia,xlqian/navitia,xlqian/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,CanalTP/navitia,CanalTP/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,Tisseo/navitia