docs: refresh getting started IA

[exactlyallan]

Overview

Reorganizes the getting-started docs so the runtime primer lives with the About NeMo Relay conceptual content, while Getting Started gets a short About entry point and AI-coding-assistant guidance.

• I confirm this contribution is my own work, or I have the right to submit it under this project's license.
• I searched existing issues and open pull requests, and this does not duplicate existing work.

Details

• Moves Agent Runtime Primer from Getting Started to About NeMo Relay and adds a redirect from the old URL.
• Adds a new Getting Started About page with starting-point guidance and a compact setup flow.
• Adds a "Using an AI coding assistant?" card to Getting Started About and Quick Start with the future no-clone npx skills add nvidia/skills --skill nemo-relay-get-started --agent codex path.
• Updates related docs and README links to the new primer location.

Where should the reviewer start?

Start with docs/getting-started/about.mdx, then review docs/about-nemo-relay/agent-runtime-primer.mdx and docs/getting-started/quick-start/index.mdx for the IA changes.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Relates to NVIDIA agent skills publication follow-up.

Testing

• just docs passed. Fern reported one warning: missing redirects check skipped because this local environment is not authenticated with fern login / FERN_TOKEN.

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Fern docs preview: https://nvidia-preview-pull-request-443.docs.buildwithfern.com/nemo/relay (​https://nvidia-preview-pull-request-443.docs.buildwithfern.com/nemo/relay​)