docs: update toolkit docs

[github-actions]

This PR contains updates to toolkit
from the zeta-chain/toolkit repository.

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Project	Deployment	Actions	Updated (UTC)
docs-v2	Ready	Preview	Mar 21, 2026 0:32am

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Duplicate non-localized file breaks project naming convention

Medium Severity

toolkit.mdx is an exact duplicate of the existing toolkit.en-US.mdx. It's the only file in src/pages/reference/ without a locale suffix alongside locale-suffixed versions. With Nextra i18n configured (defaultLocale: "en-US"), having both files creates ambiguity about which is served for English requests and risks content divergence if only one file is updated in the future.