Add Node.js tasks

[crandmck]

Changes in this pull request

New pages in Working with the SDK in Node.js.

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[crandmck]

@timmurphydev Made the specific changes we discussed, plus changed example code to JS instead of TS:

• Types removed: Parameter and return types, and annotations like { buffer: Buffer | null }, are plain JS (const dest = { buffer: null }, async (data) => { ... }, untyped function params).
• _node-read.md: Comment read-manifest.ts → read-manifest.js, usage ts-node read-manifest.ts → node read-manifest.js (matches ESM-style examples with import).
• _node-settings.md: Text now says “settings fragments” instead of “typed fragments” so it doesn’t imply TypeScript.

[timmurphydev]

It looks like everything we discussed has been updated. This looks good to me, Rand!