DOC-1162 move BYOC arch

[micheleRP]

Description

This lifts the BYOC Architecture content into its own page for better visibility and SEO. It also adds links to the section from the BYOC pages.

Resolves https://redpandadata.atlassian.net/browse/DOC-1162
Review deadline: April 2

Page previews

BYOC Architecture
RP Cloud Overview
Create BYOC

Checks

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

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[hyperlint-ai-deprecated]

PR Change Summary

Moved BYOC Architecture content to a dedicated page for improved visibility and SEO.

• Created a new page for BYOC Architecture to enhance SEO and user accessibility.
• Updated navigation to include the new BYOC Architecture page link.
• Revised existing content to reference the new BYOC Architecture page.

Modified Files

• modules/ROOT/nav.adoc
• modules/get-started/pages/cloud-overview.adoc

Added Files

• modules/get-started/pages/byoc-arch.adoc

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[kbatuigas]

One tiny nitpick, and no blockers