add doc for xdebug for macos,

fix worker cmd

docker/phraseanet/worker/entrypoint.sh

@@ -15,4 +15,4 @@ if [ ${XDEBUG_ENABLED} == "1" ]; then
     docker-php-ext-enable xdebug
 fi
 
-bash -e docker-php-entrypoint $@
+runuser -u app "$@"

docker/phraseanet/worker/scheduler-run.sh

@@ -1,3 +0,0 @@
-#!/bin/bash
-
-runuser app -c 'php bin/console task-manager:scheduler:run'