changed sidebar menu. #363 Vouchers has its own menu, kit requests is alone now and equipment/rooms/health partners are now inside configuration

WIP: first draft of privacy notice, go to /privacy_notices to list them and add them, please, create the folder privacy_notices/ before running

Issue #239 Removed get_details method and changed extend_context method to use Worker.get_by_user. Enhancement: now the superuser also shows a name in the upper right corner or its username if no full_name is available.