remove really old backuppc and nagios-client docs

Those are mostly empty, and now totally irrelevant.

old/backuppc.md

-on serra:
-
-in /etc/backuppc:
-
-- edit hosts, add the host in question
-- create a file called $host.pl,
-  . include the common file,
-  . list shares to be backed up
-  (use an existing file as template)

old/nagios-client.md

-sudo apt-get update &&
-sudo apt-get install tor-nagios-checks &&
-sudo sed -i -e 's/^#DAEMON/DAEMON/' /etc/default/nagios-nrpe-server &&
-sudo env -i /etc/init.d/nagios-nrpe-server restart &&
-if [ -e '/etc/firehol/firehol.conf' ] ; then
-        echo 'You might want to add these to /etc/firehol/firehol.conf:'
-        echo
-        cat << EOF
-server custom monit tcp/4949 default accept src 38.229.70.32
-server custom nrpe tcp/5666 default accept src 38.229.70.32
-server ntp accept src 38.229.70.32
-server icmp accept src 38.229.70.32
-EOF
-fi
-

service.md

@@ -57,8 +57,6 @@ phase.
 Those services have been retired.
 
  * [trac](howto/trac)
- * [backuppc](old/backuppc)
- * [nagios-client](old/nagios-client)
 
 ## other, non TSA stuff