docs(readme): add Latest News and Previous News sections

[Xunzhuo]

What type of PR is this?

docs: add Latest News and Previous News sections to README

What this PR does / why we need it:

This PR adds "Latest News" and "Previous News" sections to the README.md file, following the format used by the vllm project.

The Latest News section highlights recent milestones including:

• YouTube channel establishment (2025/10/16)
• Dashboard announcement (2025/10/15)
• NeurIPS 2025 paper publication (2025/10/12)
• vLLM Production Stack integration (2025/10/08)
• Kubernetes deployment support (2025/10/01)
• 1000 GitHub stars milestone (2025/09/15)
• Official release announcement (2025/09/01)

The Previous News section is included as a collapsible details element for future historical news items.

This improves the README by:

• Providing visibility into recent project achievements
• Following established conventions from the vllm project
• Creating a structured way to communicate updates to the community

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[github-actions]

👥 vLLM Semantic Team Notification

The following members have been identified for the changed files in this PR and have been automatically assigned:

📁 Root Directory

Owners: @rootfs, @Xunzhuo
Files changed:

• README.md

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🎉 Thanks for your contributions!

This comment was automatically generated based on the OWNER files in the repository.