docs: mention serverless on root --help

[Ryank90]

Summary

• Root --help Long now mentions deploying serverless applications, matching the README intro.
• Generated docs/runware.md synopsis is updated. SEE ALSO already listed runware serverless.

Test plan

• runware --help includes "deploy serverless applications"
• README first paragraph and root Long now agree

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[secretfader]

nit: test pins one word of help copy. If the goal is README and root Long staying in sync (per the PR body), compare against README L5; else the test adds little and can go.