HPCC-11108 DOCS:Nagios

Fix HPCC-11108 DOCS:Nagios
Provide documentation about Nagios
and HPCC Reporting AND Monitoring
added Nagios content.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6128 from g-pan/H11108-Nagi0s

HPCC-11108 DOCS:Nagios

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>