[Smart Accounts Kit] Update docs for version 2

[AyushBherwani1998]

Description

• Update docs for the version 2 of Smart Accounts Kit
• Remove the version 1.2.0

Issue(s) fixed

Fixes #

Preview

Checklist

• If this PR updates or adds documentation content that changes or adds technical meaning, it has received an approval from an engineer or DevRel from the relevant team.
• If this PR updates or adds documentation content, it has received an approval from a technical writer.

External contributor checklist

• I've read the contribution guidelines.
• I've created a new issue (or assigned myself to an existing issue) describing what this PR addresses.

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Note

Low Risk
Documentation and Docusaurus versioning only; no application runtime or auth logic changes.

Overview
Sets the Smart Accounts Kit Docusaurus latest release to 2.0.0 and drops the 1.2.0 versioned doc tree (including duplicate pages that now live only under version-2.0.0).

The 2.0.0 snapshot is refreshed to match the kit release: Node.js 20 prerequisites, a 2.0.0 changelog (Node 18 dropped; Robinhood Chain and Arc Testnet), updated supported networks columns (v1.5.0–v2.0.0), and corrected per-version changelog pages (1.5.0–1.7.0). Advanced Permissions docs now target production MetaMask (v13.23.0+), document wallet_requestExecutionPermissions, allowance/revocation permission types, rules reference, and simplified guides (e.g. redelegation via redelegatePermissionContext, delegationManager on permission responses). New Use skills replaces OpenClaw-specific onboarding; x402 overview plus seller/buyer guides and createx402DelegationProvider reference are added. Reference/API pages expand (ERC-7710 wallet actions, delegation utilities, x402 types, approvalRevocation caveat). Minor copy fixes and signers index moved to .mdx; older version sidebars no longer list changelog 1.2.0.

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Project	Deployment	Actions	Updated (UTC)
metamask-docs	Ready	Preview	Aug 13, 2026 12:08pm

[shahbaz17]

lgtm