docs: add quick examples for general, web3, and full profiles

[toby-bridges]

Add short command examples showing when to use --profile general, --profile web3, and --profile full. Keep the examples local-first and avoid suggesting that any profile certifies a relay as safe.

[github-actions]

Claude encountered an error after 2s —— View job

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I'll analyze this and get back to you.

[toby-bridges]

Keeping this open as a scoped post-launch backlog item. Contributions should stay reproducible, local-first, and avoid relay recommendation or certification language.