Rewritten after review

We've decided to never install the service files so we need another
section to tell people how to install the service files.

Revert "Clarify in docs that service files are not default installed (in"

This reverts commit 4662c63.

Author: vmcj

doc/manual/install-judgehost.rst

@@ -178,7 +178,7 @@ added kernel options. On VM hosting providers such as Google Cloud or
 DigitalOcean, ``GRUB_CMDLINE_LINUX_DEFAULT`` may be overwritten
 by other files in ``/etc/default/grub.d/``.
 
-You have now configured the system to use cgroups. In a FHS install, to create
+You have now configured the system to use cgroups. To create
 the actual cgroups that DOMjudge will use, run::
 
   sudo systemctl enable create-cgroups --now
@@ -231,6 +231,3 @@ the judgedaemon.
 The judgedaemon can also be run as a service by running::
 
   sudo systemctl enable --now domjudge-judgehost
-
-This only works in a FHS install, if the judgehost has been installed with another
-option those `service` files have to manually copied to the right directory e.g. `/etc/systemd`.