Remove dupe

[paulohtb6]

Description

Resolves https://redpandadata.atlassian.net/browse/
Review deadline:

Page previews

Checks

• New feature
• Content gap
• Support Follow-up
• Small fix (typos, links, copyedits, etc)

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Caution

Review failed

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📝 Walkthrough

Walkthrough

This pull request updates the Redpanda documentation site for version 25.3, introducing new disaster recovery features and reorganizing documentation structure. Changes include: updating Antora version configuration from 25.2 to 25.3 with prerelease flags; adding the beta branch to GitHub Actions build triggers; adding comprehensive Shadowing disaster recovery documentation (overview, setup, monitoring, failover, and runbook); restructuring Admin API documentation to distinguish legacy RESTful and ConnectRPC endpoints; adding GCP BigLake integration for Iceberg topics; reorganizing Schema Registry documentation around modes (read-write, read-only, import); updating cross-references throughout the nav and related documentation; and modernizing various cluster maintenance and monitoring documentation sections.

Sequence Diagram(s)

Sequence diagrams are not applicable here, as these changes are primarily documentation content additions, reorganization, and configuration updates without introducing new system interactions or control flows.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Areas requiring extra attention:

• Disaster Recovery / Shadowing section (modules/deploy/pages/redpanda/manual/disaster-recovery/shadowing/): Multiple new comprehensive documentation files added; verify technical accuracy of failover procedures, command examples, and prerequisites, particularly failover-runbook.adoc with detailed rpk commands and troubleshooting steps
• Cross-reference consistency: Updates span 40+ files with cross-reference changes; verify all xref links in nav.adoc, properties, and partials resolve correctly (e.g., configure-availability.adoc → configure-client-connections.adoc transitions)
• Antora configuration changes (.github/workflows/build.yml, antora.yml, local-antora-playbook.yml): Verify version bumps, branch triggers, and playbook source branch additions are syntactically correct and aligned across all three files
• Conditional content blocks: New ifdef/ifndef blocks added for env-cloud and env-kubernetes; verify conditions are placed correctly and surrounding content flows properly
• Admin API documentation restructuring: New ConnectRPC endpoint documentation (v2) alongside legacy endpoints (v1); ensure both endpoint types are clearly distinguished and examples are accurate for both

Possibly related PRs

• dr: adds shadowing docs #1381: Adds overlapping Shadowing disaster-recovery documentation and related navigation entries, directly overlapping with this PR's disaster recovery content
• DOC-1643 single source client connections in docs #1357: Modifies client-connections documentation area and updates cluster-properties references with env-cloud gating, overlapping with manage-throughput and configure-client-connections changes
• Update build.yml #1439: Updates .github/workflows/build.yml to add beta branch to push.branches trigger, a direct duplicate of this PR's workflow change

Suggested reviewers

• JakeSCahill
• mattschumpert

Pre-merge checks and finishing touches

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The pull request description is incomplete; it contains only placeholder template text with no actual description of changes, no JIRA ticket link filled in, no review deadline, and no page preview links provided.	Fill in the description template with the actual JIRA ticket number, a clear summary of changes, relevant page previews, and select the appropriate check box (likely 'Small fix' based on the large changeset).
Title check	❓ Inconclusive	The title 'Remove dupe' is vague and does not clearly convey what duplication was removed or which files/changes are involved.	Provide a more specific title that describes what duplicate was removed (e.g., 'Remove duplicate include directive in remote-read-replicas.adoc').

✅ Passed checks (1 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch remove-dupe

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