Logging 6x - Docs Outline / Planning

[libander]

Version(s): 4.16+

Issue: https://issues.redhat.com/browse/OBSDOCS-1099

Link to docs previews:

https://76623--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/logging-6.0/log6x-about.html https://76623--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/logging-6.0/log6x-clf.html https://76623--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/logging-6.0/log6x-loki.html https://76623--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/logging/logging-6.0/log6x-start.html

Additional information: Not intended to merge, this PR is for planning & collaboration.