HPCC-11660 DOCS:Add System Admin guide to Doc. Set

Fix HPCC-11660 DOCS:Add System Admin guide to Doc. Set
Add System Admin Doc to HPCC document set
Also adding the structures to enable
automate building.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
HPCC-11660 DOCS:Add System Admin guide

Fix HPCC-11660 DOCS:Add System Admin guide
Add System Admin guide to our automatically
produced doc. set.

Signed-off-by: g-pan <greg.panagiotatos@lexisnexis.com>
Merge pull request #6063 from g-pan/H11660-AddSysAdmin

HPCC-11660 DOCS:Add System Admin guide to Doc. Set

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>