docs: model support page

[terrykong]

Replaces

https://github.com/NVIDIA-NeMo/RL/pull/1706/changes
https://github.com/NVIDIA-NeMo/RL/pull/1705/changes

Summary by CodeRabbit

• Documentation

  • Added comprehensive guide documenting Hugging Face model support, including LLM and VLM capabilities, supported model families, and optimization paths.
  • Expanded navigation with new model support reference section.

• Chores

  • Streamlined documentation build system with updated workflow.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Documentation build environment is refactored to use UV (uv) package manager exclusively instead of cross-platform virtual environment logic. A new documentation page describing Hugging Face model support via NeMo is introduced and integrated into the navigation.

Changes

Cohort / File(s)	Summary
Build System Simplification docs/Makefile	Removed cross-platform venv setup (Windows scripts, RM variable). Introduced UV_RUN variable for centralized command execution. Replaced ensure-docs-env target with check-uv. Updated docs-html, docs-publish, docs-live targets to depend on check-uv and use UV_RUN for sphinx-build/sphinx-autobuild invocations. Removed environment activation guidance messages.
Documentation Content docs/about/model-support.md, docs/index.md	Added new model-support.md documenting Hugging Face model support (LLMs, VLMs) via NeMo AutoModel and Megatron-Bridge, including supported families and optimization details. Integrated new page into docs navigation toctree and index.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Possibly related PRs

• docs: Refactor Home Page and New About Section #1338: Directly modifies docs/Makefile and the ensure-docs-env logic that this PR replaces with UV-driven workflow.

Suggested labels

documentation, CI:docs

Suggested reviewers

• lbliii

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: adding a new documentation page for model support, which is the primary objective reflected in the raw summary and PR description.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Test Results For Major Changes	✅ Passed	PR contains only documentation and build system changes with no runtime code modifications.

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[coderabbitai]

Actionable comments posted: 2

🤖 Fix all issues with AI agents

In `@docs/about/model-support.md`:
- Around line 15-30: Standardize the Nemotron naming and YAML capitalization:
change the heading "NeMotron" to "Nemotron" and normalize variants to consistent
casing (e.g., "Llama-Nemotron-Super-49B", "Nemotron-nano-v2-12B" -> consider
"Nemotron-nano-v2-12B" vs "Nemotron-nano-v3-30A3B" but ensure all use "Nemotron"
with the same capitalization pattern), and replace the lowercase "yaml" with
"YAML" in the final sentence; update all occurrences of the strings "NeMotron",
"Nemotron-Nano", and "yaml" in this section to the standardized forms.
- Around line 3-13: The intro contains grammar and punctuation issues and a
sentence fragment: update the paragraph starting "NeMo-RL support 🤗Hugging Face
models..." and the following fragment "for model sizes under 70B at up to 32k
sequence length." into a single, grammatically correct sentence (e.g., "NeMo-RL
supports Hugging Face models from the following classes — LLMs
(AutoModelForCausalLM) and VLMs (AutoModelForImageTextToText) — for model sizes
under 70B and sequence lengths up to 32k."), fix spacing around
links/parentheses, ensure "supports" is used (not "support"), remove the
fragment, and normalize punctuation/spacing in the "NeMo Megatron-bridge"
heading paragraph so sentences are complete and links are punctuated
consistently.