docs: add "What's Hot" section to README

[lbliii]

Summary

• Adds a "What's Hot" section to the top of the README highlighting Slurm deployment, Audio curation, and the Inference Server
• Sits above the existing "Updates" release log so feature highlights and release history serve distinct purposes
• Addresses #1552 (better surfacing of new features on the landing page)

Context

Requested by Arham in #docs Slack thread — developers landing on the README should immediately see the latest capabilities worth trying. The three highlighted features were called out by Arham; cc @nemo-curator-leads if anything else should be added before merge (candidates: Cosmos-Embed1 video embeddings, Nemotron-CC recipe, simplified Resources API).

Test plan

• Preview README rendering on GitHub
• Verify all three doc links resolve
• Confirm leads are aligned on the three highlighted features

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[greptile-apps]

Greptile Summary

This PR adds a new "What's Hot" section near the top of the README to surface recently shipped capabilities that developers should know about on first landing. The section uses the same Markdown table style already present elsewhere in the file and sits above the existing "Updates" release log.

• Adds a three-row feature table with display names, one-line value props, and links to the NeMo Curator docs for Slurm deployment, Audio curation, and the Inference Server.
• Appends a blockquote callout inviting contributors to suggest additions; @nemo-curator-leads is correctly wrapped in backticks so GitHub does not interpret it as a user mention.

Confidence Score: 5/5

Documentation-only change with no code or configuration touched — safe to merge.

The change adds a small Markdown table and a blockquote to the README. Nothing executable is modified, the new links point to the same docs domain already used throughout the file, and the @nemo-curator-leads handle is correctly escaped with backticks so it won't fire a GitHub notification.

No files require special attention.

Important Files Changed

Filename	Overview
README.md	Adds a "What's Hot" table section above the existing Updates log, featuring three doc links for Slurm deployment, Audio curation, and Inference Server — purely editorial, no code changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README top] --> B[Badges & Title]
    B --> C["**NEW** What's Hot table\n(Slurm · Audio · Inference Server)"]
    C --> D[Updates release log]
    D --> E[What You Can Do table]
    E --> F[Quick Start]
    F --> G[Architecture & further sections]

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