Edit multi-validator consensus docs

[alexandratran]

Refactor Multi-validator consensus concept page (edit pass for clarity, style, and conciseness). Also another edit pass to the related guide, renamed from Set up distributed sequencing to Run multiple validators. Minor edits to related content on other pages, plus redirects and link changes as needed.

Preview: https://doc-linea-git-distributed-sequencing-consensys-incorporated.vercel.app/stack/deployment/multi-validator-consensus

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Note

Low Risk
Documentation, redirects, and styling only; no application or infrastructure code changes.

Overview
This PR restructures and rewrites Lineth docs for multi-validator Maru / QBFT: the deployment concept page moves from distributed-sequencing to multi-validator-consensus, and the operator guide is renamed from Set up distributed sequencing to Run multiple Maru validators (run-multiple-validators), with clearer split between design (topology, latency, fault scope) and procedures (keys, static peering, genesis validator-set updates, metrics, quorum recovery, rolling upgrades).

Cross-site updates point links, sidebars, action cards, llms.txt, and redirects at the new URLs. High availability copy and diagrams now say sequencer node instead of generic QBFT validator labels. The consensus SVG is resized/refined; .img-fit CSS and doc zoom selectors support full-width graphics.

No runtime stack changes—documentation and site navigation only.

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Project	Deployment	Actions	Updated
doc-linea	Ready	Preview	Oct 2, 2026 9:45pm UTC

[bgravenorst]

Just the one minor comment.