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

🤖 Generated with Claude Code

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[greptile-apps]

Greptile Summary

This PR adds a "What's Hot" section to the top of README.md, surfacing three key capabilities — Slurm deployment, Audio curation, and the Inference Server — with a Markdown table linking to their respective docs pages.

• A new ## What's Hot section with a three-row feature table is inserted between the NeMo suite tagline and the existing ## Updates release log.
• A blockquote callout invites contributors to suggest additional features via an issue or team mention.

Confidence Score: 5/5

Documentation-only change with no code modifications; safe to merge once the three linked doc URLs are manually confirmed to resolve.

The change is limited to inserting a Markdown table and blockquote in README.md. No logic, configuration, or runtime behaviour is affected. The only open question is whether the three external documentation URLs resolve correctly, which the PR's own test plan flags as an outstanding check.

No files require special attention beyond confirming the three external doc links are live before merge.

Important Files Changed

Filename	Overview
README.md	Adds a 'What's Hot' table section above the existing Updates log, linking to Slurm deployment, Audio curation, and Inference Server docs; no structural issues found.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README.md] --> B[Badges & Header]
    B --> C[NeMo suite tagline]
    C --> D["## What's Hot (NEW)"]
    D --> D1["Curator on Slurm → Slurm Deployment Guide"]
    D --> D2["Audio Curation → Audio Guide"]
    D --> D3["Inference Server → Inference Server docs"]
    D --> E["## Updates (release log)"]
    E --> F["## What You Can Build"]
    F --> G[Rest of README...]

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_{Reviews (3): Last reviewed commit: "Merge branch 'main' into lbliii/readme-w..." | Re-trigger Greptile}

[sarahyurick]

This link is broken for me.

[sarahyurick]

Agree that we should list audio curation but not sure this is the best description since transcription, WER filtering, and quality assessment were the first things added to audio. Since then several other pipelines have been added: https://github.com/NVIDIA-NeMo/Curator/commits/main/nemo_curator/stages/audio

Maybe most notably, ALM (Audio Language Model) data curation, quality filtering via AudioDataFilterStage, and audio tagging and speaker diarization. (Claude can probably summarize these concepts better than me.)