Add Templates section with x402 and EncryptedERC starter kits

[tomi204]

Added a new Templates section to the documentation with comprehensive
guides for two Avalanche starter kits:

1. x402 Starter Kit - Next.js template for payment-gated APIs and content services using the x402 protocol on Avalanche C-Chain

2. EncryptedERC - Privacy-preserving ERC-20 token protocol with confidential transfers using zero-knowledge proofs

Features:

• New Templates tab in docs navigation bar
• Templates landing page with overview
• Detailed x402 Starter Kit guide with step-by-step setup
• Complete EncryptedERC guide with ZK-proof implementation
• Hamburger menu with quick links to both templates

Files added:

• content/docs/templates/index.mdx
• content/docs/templates/meta.json
• content/docs/templates/x402-starter-kit.mdx
• content/docs/templates/encrypted-erc.mdx

Files modified:

• lib/source.ts
• app/docs/layout.tsx
• app/docs/docs-layout-wrapper.tsx
• components/navigation/docs-subnav.tsx

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[tomi204]

Template Image:

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Project	Deployment	Preview	Comments	Updated (UTC)
builder-hub	Ready	Preview	Comment	Nov 14, 2025 7:39pm

[tomi204]

Deployed x402 demo: x402-starter-kit-next.vercel.app

[Andyvargtz]

@tomi204 we require all commits to be verified to merge changes to master.