feat: add Upgrading Node.js info page with navigation and EOL CTAs

[edsadr]

Summary

This PR adds a new Upgrading Node.js page under /about/upgrading-nodejs with:

• A new page providing guidance on upgrading Node.js versions
• A CTA on the EOL page linking to the new page (replaces the direct download link)
• Navigation entry in navigation.json
• i18n labels in en.json
• NodeSourceLogo component registration
• @nodejs/doc-kit added to pnpm-workspace.yaml allowBuilds

Goal

This is a starting point — we would like to invite the Node.js Userland Migrations Working Group to collaborate, refine, and own the final version of this page for inclusion in the official Node.js website.

The intention is to provide a canonical resource that helps users assess their upgrade readiness, understand breaking changes, and plan migrations — something the Node.js community has long needed.

What is Next?

We are opening this early to gather feedback from the working group and the broader community. The content, design, and tooling integrations are all open for discussion.

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This is a draft PR — ready for collaboration, not merge.

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