docs: add serverless to the README

[Ryank90]

Summary

• Mention serverless in the README intro and quick start, next to inference.
• Add a runware serverless command section with deploy, invoke, logs, env, secrets, scale, and lifecycle examples, linking to the generated docs.
• Include RUNWARE_DASHBOARD_URL and list serverless in the completion demo.

Test plan

• README intro and quick start mention runware serverless deploy
• Examples match the current command names (apps invoke, secrets attach, apps env set)
• Create-only flags and the env/secret rollout note do not tell people to redeploy source to change a variable

[coderabbitai]

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_{Comment @coderabbitai help to get the list of available commands.}

[wilsonsilva]

thought (non-blocking): This block copies about 25 commands from the generated reference, and make docs does not update the README. Keep the main flow (gpus, deploy, invoke, logs) and let the link carry the rest, so that this copy does not go stale.