docs: Add real-world examples of Curator for Nemotron datasets and SE…

[Pritiks23]

Description

Adds real-world examples to the documentation showing how NeMo Curator is used to build Nemotron datasets, including LANL/NVIDIA collaboration and SES AI Chemistry LLM use cases.
Closes #1548.

Usage

See docs/about/index.md for real-world usage scenarios and references.

## Checklist
<!--
Note: All commits need to be signed and signed off. This can be done via `-sS` flags while commiting
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- [Y ] I am familiar with the [Contributing Guide](https://github.com/NVIDIA-NeMo/Curator/blob/main/CONTRIBUTING.md).
- [ ] New or Existing tests cover these changes.
- [Y ] The documentation is up to date with these changes.

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[greptile-apps]

Greptile Summary

This PR adds a "Curator in Action" section to docs/about/index.md showcasing real-world NeMo Curator use cases (LANL/NVIDIA ICF collaboration and SES AI Chemistry LLM), along with minor copy fixes in the How It Works section.

• The new content block was inserted at line 57 inside an unclosed :::{grid-item-card} directive, and the original Image/Video/Audio card content (:link: options, bodies, closers) was left duplicated outside the grid from line 98 onward — both issues have been flagged in prior review rounds and remain unresolved in the current head commit.

Confidence Score: 3/5

Not safe to merge — the directive structure in the Concepts grid is broken and orphaned card content remains in the file.

Two P1 structural issues flagged in prior review rounds remain unresolved: a duplicate Image card opener (lines 57-58) and orphaned :link: options plus duplicate card directives outside the grid (lines 98-118). These will cause Sphinx-Design rendering failures for the Concepts section. The new prose content itself is correct and the referenced Nemotron-CC link resolves to a valid file.

docs/about/index.md — lines 57-58 (duplicate opener) and lines 98-118 (orphaned directives) require cleanup before the page renders correctly.

Important Files Changed

Filename	Overview
docs/about/index.md	New "Curator in Action" section added with valid prose and link, but the insertion left a duplicate Image card opener (lines 57-58) and orphaned :link:/card directives (lines 98-118) outside any grid container, breaking the Sphinx-Design directive structure.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["docs/about/index.md"] --> B["## Concepts grid block\n(lines 47-79)"]
    B --> C["Text card ✅"]
    B --> D["Image card opener ×2\n(lines 57-58) ⚠️"]
    D --> E["New: Image card with options ✅"]
    D --> F["New: Video card ✅"]
    D --> G["New: Audio card ✅"]
    D --> H["Grid closer ::::"]
    A --> I["## Curator in Action section\n(lines 81-97) ✅ new content"]
    A --> J["Orphaned Image :link: options\n(lines 98-99) ⚠️"]
    A --> K["Orphaned Image/Video/Audio cards\n(lines 101-118) ⚠️"]

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_{Reviews (5): Last reviewed commit: "Update docs/about/index.md" | Re-trigger Greptile}

[jgerh]

Completed tech pubs review and provided a few copyedits

[jgerh]

Verify orphaned/duplicated grid-card markup from Lines 58-78 left appended after the SES AI paragraph in Lines 97–117.