add content from old lcsops page

docs/onboarding/index.md

@@ -112,12 +112,11 @@ pts adduser -user $USERNAME -group linux:adm
 
 Ask a current member of the Linux team to add you to:
 
-- access.redhat.com
-- hub.docker.com
+- [access.redhat.com](https://access.redhat.com)
+- [hub.docker.com](https://hub.docker.com/u/cern)
 
-### Common agreements
+### Useful bookmarks
 
-TBD, but:
-
-* Merge Requests policy
-* Jira tickets
+* Pending tasks are tracked via the [LOS](https://its.cern.ch/jira/browse/LOS) Jira project
+* [Availability History of Linuxsoft](https://monit-grafana.cern.ch/d/000000855/overview-service-availability?orgId=1&var-service=linuxsoft)
+* [Historical operational documentation](https://twiki.cern.ch/twiki/bin/view/LinuxSupport/LinuxSupportInternals) - Note - this is provided as an old reference, though should not ever be needed