Add new Iceberg modes doc in Cloud

[kbatuigas]

Description

Add single sourced content for Iceberg modes. See redpanda-data/docs#1068

Resolves https://github.com/redpanda-data/documentation-private/issues/
Review deadline:

Page previews

Choose an Iceberg Mode

Checks

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

Summary by CodeRabbit

• New Features

  • Added a new documentation page, "Choose an Iceberg Mode," detailing supported Iceberg modes and schema integration guidance.
  • Updated the navigation menu to include a direct link to the new "Choose Iceberg Mode" page under the Iceberg section.

• Chores

  • Updated the Antora playbook to reference a specific feature branch for documentation content sources.

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[coderabbitai]

Walkthrough

The changes introduce a new documentation page titled "Choose an Iceberg Mode" under the Iceberg section. This includes updating the navigation to add a link to the new page and modifying the Antora playbook to source content from a specific feature branch instead of the main branch. No changes were made to exported or public entities in the codebase.

Changes

File(s)	Change Summary
local-antora-playbook.yml	Updated the content source branch from main to a specific feature branch for documentation generation.
modules/ROOT/nav.adoc	Added a new navigation entry "Choose Iceberg Mode" under the Iceberg section.
modules/manage/pages/iceberg/choose-iceberg-mode.adoc	Added a new documentation page about selecting Iceberg modes and integrating schemas with Iceberg topics.

Poem

A new mode for Iceberg, now easy to find,
With docs and a link, all neatly aligned.
The playbook now points to a branch that is new,
So readers and writers know just what to do.
🐇 Hopping through docs, with changes so bright,
The Iceberg adventure is now in plain sight!

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[coderabbitai]

Actionable comments posted: 2

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 293e988 and 921e0a9.

⛔ Files ignored due to path filters (1)

• modules/shared/images/schema-registry-wire-format.png is excluded by !**/*.png

📒 Files selected for processing (3)

• local-antora-playbook.yml (1 hunks)
• modules/ROOT/nav.adoc (1 hunks)
• modules/manage/pages/iceberg/choose-iceberg-mode.adoc (1 hunks)

🔇 Additional comments (2)

modules/manage/pages/iceberg/choose-iceberg-mode.adoc (2)

1-4: Page metadata aligns with Antora standards.
The title, description, categories, and beta flag follow Antora front matter conventions.

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6-6: Verify the include directive and tag.
Confirm that the single-source tag exists in the referenced external snippet to prevent Asciidoctor include failures.

[Feediver1]

lgtm