chore: fix docs for new references (#1315)

Navigation docs were pushing deployment guide followers into
the operations guide, which was confusing.

Signed-off-by: Kevin Carter <[email protected]>

Author: cloudnull

mkdocs.yml

@@ -318,13 +318,6 @@ nav:
           - Override Public Endpoint fqdn for service catalog: openstack-override-public-endpoint-fqdn.md
           - Service Overrides: openstack-service-overrides.md
           - Resource and Project Lookups: openstack-resource-lookups.md
-          - Reservation:
-              - Blazar Reservations Creation: openstack-blazar.md
-          - Backup Restore:
-              - Freezer Backup Restore Creation: openstack-freezer.md
-          - Message Queue:
-              - Zaqar Message Queue Creation: openstack-zaqar.md
-
       - Working locally With Docs: mkdocs-howto.md
   - Cloud Onboarding:
       - Cloud Onboarding Welcome: cloud-onboarding-welcome.md