DOC-6745 RDI: remove redundancies and restructure

[andy-stark-redis]

NOTE: not finished - this is just to get early feedback from the Bugbot.

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Note

Low Risk
Documentation-only edits (moves, link updates, and prerequisite consolidation) with no product or runtime behavior changes.

Overview
Restructures Redis Data Integration docs to cut duplication and put pipeline behavior next to pipeline setup.

Reliability topics (at-least-once delivery, checkpointing, backpressure) move from Architecture into a new Pipeline features section on Data pipelines. FAQ, troubleshooting, and the RDI overview now link to data-pipelines#backpressure-mechanism instead of the architecture anchor.

The overview Supported source databases section drops the embedded version table in favor of a short list and a link to Prepare source databases. Architecture keeps a Debezium Server pointer there too and removes its own copy of those feature sections and the supported-sources embed.

Install on K8s and Install on VMs use a Prerequisites layout: RDI DB, hardware/OS, and K8s version requirements point at requirements summary (reqsummary) instead of repeating embed-md blocks. Source CDC prep is listed under “Before you run RDI,” and redundant end-of-page “Prepare your source database” / embedded K8s version sections are removed.

^{Reviewed by Cursor Bugbot for commit c6fda42. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

DOC-6745

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6745-rdi-remove-redundant-info-and-improve-structure/integrate/redis-data-integration/
https://redis.io/docs/staging/DOC-6745-rdi-remove-redundant-info-and-improve-structure/integrate/redis-data-integration/architecture/
https://redis.io/docs/staging/DOC-6745-rdi-remove-redundant-info-and-improve-structure/integrate/redis-data-integration/data-pipelines/
https://redis.io/docs/staging/DOC-6745-rdi-remove-redundant-info-and-improve-structure/integrate/redis-data-integration/faq/
https://redis.io/docs/staging/DOC-6745-rdi-remove-redundant-info-and-improve-structure/integrate/redis-data-integration/installation/install-k8s/
https://redis.io/docs/staging/DOC-6745-rdi-remove-redundant-info-and-improve-structure/integrate/redis-data-integration/installation/install-vm/
https://redis.io/docs/staging/DOC-6745-rdi-remove-redundant-info-and-improve-structure/integrate/redis-data-integration/troubleshooting/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

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