OSDOCS-15228 [Network Observability Migration Phase 0] Clean the repo

[gwynnemonahan]

OSDOCS-15228 [Network Observability Migration Phase 0] Clean the repo

Version(s):
4.16+ since applies to migration

Issue:
https://redhat.atlassian.net/browse/OSDOCS-15228

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

• Was originally to be completed as part of moving Network Observability Operator docs to the stand alone format.
• Network Observability Operator docs are no longer moving to the stand alone format.

[ocpdocs-previewbot]

🤖 Tue Jul 14 17:53:14 - Prow CI generated the docs preview:

https://115381--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/metrics-alerts-dashboards.html
https://115381--ocpdocs-pr.netlify.app/openshift-enterprise/latest/observability/network_observability/release_notes_archive/network-observability-operator-release-notes-archive.html

[openshift-ci]

@gwynnemonahan: all tests passed!

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