docs: add Polkadot & Kusama section

[benceharomi]

Why

The Kusama ZK bounty curators asked whether ZK Email would add a Kusama section to docs.zk.email, pointing out that a developer building on Kusama who browses these docs has no way to find the Polkadot/PolkaVM work.

That was accurate: the sitemap had 72 URLs and zero matches for polkadot, kusama, polkavm or paseo. Everything lived in per-repo kusama-grant branches on GitHub, which nobody browsing the docs would find.

What this adds

A landing page at /kusama/ covering:

• The DKIM registry deployed on Paseo Asset Hub, and how its keys are kept current automatically
• Creating a blueprint that targets Polkadot Hub Testnet, which deploys the verifier for you
• Verifying proofs on-chain with verifyProofOnChain
• Deploying a verifier yourself, for anyone who wants one they control
• Chain and contract reference, at the end rather than in the middle
• Links out to the per-repo engineering docs rather than duplicating them
• A closing note on the standalone PolkaVM Hardhat template published for the wider Polkadot community

Plus a sidebar heading, a navbar entry, and one cross-link each from the ZK Email Verifier overview and the Blueprint SDK setup page.

Availability labelling

Some of this is not on a stable surface yet, so the page says so rather than implying it works today:

• Paseo support in verifyProofOnChain ships in the nightly SDK release; stable verifies against Base Sepolia only
• Chain selection is currently available on the staging registry

Both labels can come out in a one-line follow-up once those ship.

The deployed contracts are listed with Blockscout links but are deliberately not described as source-verified. They report is_verified: false, which is the known PolkaVM tooling gap (no resolc-aware verify task), and the page explains that so nobody thinks their own deployment went wrong.

Notes for review

• Entirely additive: 131 insertions, 0 deletions
• yarn build passes, which with onBrokenLinks: 'throw' means every internal link resolves; broken anchors are also clean
• All external links were verified to resolve
• The navbar goes from 4 items to 5. If that crowds at narrow widths, dropping the navbar entry and keeping the sidebar one is a one-line change
• Local preview needs Node <= 22 and POSTHOG_API_KEY set to any value

[coderabbitai]

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[claude]

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