Pull request #2035: PIPE-3252: document observatory services and monitors
Merge in PIPE/pipeline from docs/observatory-services-monitoring to main
* commit 'ff257dbfc5ca70a9cc8b298a1af79105ce8c6e60': PIPE-3252: Add maintainer information for Casaconfig and Pipeline Services monitors PIPE-3252: document observatory services and monitors
PIPE-3252: document observatory services and monitors
Add documentation for external observatory web services, CASA runtime data, and operational health monitors (`casaconfig-monitor` and `pipeline-services-monitor`).