Remove DC-task-debug-failed-systemd-services

Related to https://gitlab.suse.de/susedoc/docserv-config/-/merge_requests/1117

config.xml

@@ -273,7 +273,6 @@
   <doc cat="smartdocs" doc="vm-assign-pci-device" branches="main">Assigning host devices to a virtual machine</doc>
   <doc cat="smartdocs" doc="cpu-check-temperature" branches="main">Check and monitor CPU temperature</doc>
   <doc cat="smartdocs" doc="task-configure-virtual-machine-manager" branches="main">Configuring virtual machines with Virtual Machine Manager</doc>
-  <doc cat="smartdocs" doc="task-debug-failed-systemd-services" branches="main">Debugging failed systemd services</doc>
   <doc cat="smartdocs" doc="task-delete-modules-extensions" branches="main">Deleting modules and extensions</doc>
   <doc cat="smartdocs" doc="forward-root-mail" branches="main">Configuring mail forwarding for root</doc>
   <doc cat="smartdocs" doc="task-modify-kernel-boot-parameter" branches="main">Modifying kernel boot parameters</doc>