TELCODOCS-2045 - Telco core RDS 4.18 docs

[aireilly]

Adds docs for core RDS 4.18. Also moves up the RDS to facilitate usability on docs.redhat.com

Note for reviewers:
modules/telco-core-crs-* files are generated and reviewed upstream and do not require review.
This PR is intended for 4.18 GA, but because Aidan is on PTO on merge freeze day, please do not merge the PR after review. - Kathryn

Version(s):
enterprise-4.18

Issue:
https://issues.redhat.com/browse/TELCODOCS-2045

Link to docs preview:
https://88622--ocpdocs-pr.netlify.app/openshift-enterprise/latest/scalability_and_performance/telco_core_ref_design_specs/telco-core-rds.html

QE review:

• QE has approved this change.

[ocpdocs-previewbot]

🤖 Mon Feb 24 17:21:42 - Prow CI generated the docs preview:

https://88622--ocpdocs-pr.netlify.app/
https://88622--ocpdocs-pr.netlify.app/openshift-enterprise/latest/scalability_and_performance/cluster-compare/understanding-the-cluster-compare-plugin.html
https://88622--ocpdocs-pr.netlify.app/openshift-enterprise/latest/scalability_and_performance/cluster-compare/using-the-cluster-compare-plugin.html
https://88622--ocpdocs-pr.netlify.app/openshift-enterprise/latest/scalability_and_performance/index.html
https://88622--ocpdocs-pr.netlify.app/openshift-enterprise/latest/scalability_and_performance/telco_core_ref_design_specs/telco-core-rds.html

[openshift-ci]

@aireilly: all tests passed!

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[aireilly]

/cherry-pick enterprise-4.18

[openshift-cherrypick-robot]

@aireilly: #88622 failed to apply on top of branch "enterprise-4.18":

Applying: Telco core RDS 4.18 docs
Using index info to reconstruct a base tree...
M	_topic_maps/_topic_map.yml
M	scalability_and_performance/telco_ref_design_specs/core/telco-core-ref-design-components.adoc
Falling back to patching base and 3-way merge...
Removing scalability_and_performance/telco_ref_design_specs/core/telco-core-ref-software-artifacts.adoc
CONFLICT (modify/delete): scalability_and_performance/telco_ref_design_specs/core/telco-core-ref-design-components.adoc deleted in Telco core RDS 4.18 docs and modified in HEAD. Version HEAD of scalability_and_performance/telco_ref_design_specs/core/telco-core-ref-design-components.adoc left in tree.
Removing scalability_and_performance/telco_ref_design_specs/core/telco-core-ref-crs.adoc
Removing scalability_and_performance/telco_ref_design_specs/core/telco-core-rds-use-cases.adoc
Removing scalability_and_performance/telco_ref_design_specs/core/telco-core-rds-overview.adoc
CONFLICT (content): Merge conflict in scalability_and_performance/telco_core_ref_design_specs/snippets
CONFLICT (content): Merge conflict in scalability_and_performance/telco_core_ref_design_specs/modules
CONFLICT (content): Merge conflict in scalability_and_performance/telco_core_ref_design_specs/images
CONFLICT (content): Merge conflict in scalability_and_performance/telco_core_ref_design_specs/_attributes
Auto-merging _topic_maps/_topic_map.yml
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"
Patch failed at 0001 Telco core RDS 4.18 docs

In response to this:

/cherry-pick enterprise-4.18

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