docs: Revise Security Monitoring guides and remove outdated install g…#86

travisamartin wants to merge 3 commits intonim-2.19.0-releasenginx/documentation:nim-2.19.0-releasefrom

docs-1604-decouple-security-monitoringnginx/documentation:docs-1604-decouple-security-monitoringCopy head branch name to clipboard