DOC-1825 Document Cloud Feature Cloud Topics

[micheleRP]

Description

DO NOT MERGE UNTIL 26.1 + revert playbook

This pull request single sources Cloud Topics for Redpanda Cloud:

• Added a new topics-index.adoc page to serve as an index for topic-related documentation, providing an overview of creating and managing topics in Redpanda Cloud.
• Updated the navigation in nav.adoc to group topic-related pages under the new "Topics" section, including "Create a Topic", "Manage Topics", and the newly added "Manage Cloud Topics" page.
• Added a new cloud-topics.adoc page to explain Cloud Topics and their benefits, and included single-sourced content from the develop module.

Antora playbook update:

• Modified the local-antora-playbook.yml to pull documentation from the new DOC-1602 branch in addition to the existing branches.

Resolves https://redpandadata.atlassian.net/browse/DOC-1825
Review deadline:

Page previews

Manage Cloud Topics

Checks

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

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📝 Walkthrough

Walkthrough

The PR adds a new branch (DOC-1602) to the Antora playbook's sources configuration, restructures topic-related navigation by nesting topic management pages under a parent "Topics" index page, and creates two new AsciiDoc documentation pages (topics-index.adoc and cloud-topics.adoc) in the get-started module to organize topic documentation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• DOC-1448 update rpk transform in cloud overview #328: Modifies the same local-antora-playbook.yml branches list, potentially conflicting or complementing branch additions
• Add Iceberg Snowflake doc to Cloud #302: Updates both local-antora-playbook.yml and modules/ROOT/nav.adoc while adding new single-source documentation pages with similar structural changes
• Add migration pages to Cloud #511: Modifies Antora playbook branch listings and navigation entries for documentation source configuration

Suggested reviewers

• paulohtb6
• mattschumpert
• travisdowns

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding documentation for the Cloud Topics feature with a dedicated section in the navigation structure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The pull request description includes all required sections: a clear description of changes, a Jira issue reference, page previews, and appropriate category checkboxes selected.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch DOC-1825-Document-Cloud-Feature-Cloud-Topics-Public-Beta

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