Update docs to use NVIDIA Sphinx theme

[bdice]

Description

Updates the cuDF docs to use the NVIDIA Sphinx theme, following the same direction as rapidsai/rmm#2443.

This removes the local RAPIDS custom CSS/JS injection from the Sphinx and Doxygen docs configuration, switches the cuDF and dask-cuDF Sphinx configs to nvidia_sphinx_theme, and updates docs dependencies from pydata-sphinx-theme to nvidia-sphinx-theme.

Validation

• Parsed edited Sphinx config files with ast.parse.
• Parsed dependencies.yaml and generated conda environment YAML files with yaml.safe_load.
• Ran commit-time pre-commit hooks, including RAPIDS dependency file generator.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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📝 Walkthrough

Walkthrough

Updates Sphinx documentation dependencies and configuration to use nvidia-sphinx-theme, adds sidebar navigation templates, and changes a PackedColumns null check in cudf_streaming.

Changes

Sphinx Theme Migration

Layer / File(s)	Summary
Dependency specs updated dependencies.yaml, conda/environments/all_cuda-*	Removes pydata-sphinx-theme>=0.15.4 and adds nvidia-sphinx-theme under pip: in all four conda environment files and dependencies.yaml.
Documentation config and asset cleanup docs/cudf/source/conf.py, docs/dask_cudf/source/conf.py, cpp/doxygen/header.html, docs/cudf/source/cudf/developer_guide/documentation.md	Switches Sphinx themes to nvidia_sphinx_theme, removes html_logo, deletes remote CSS/JS injection, updates project names, removes custom Doxygen asset tags, and updates the theme reference in docs.
Sidebar navigation templates docs/cudf/source/_templates/sidebar-nav-bs.html, docs/dask_cudf/source/_templates/sidebar-nav-bs.html	Adds sidebar templates that build section navigation from the active page and theme navigation settings.

PackedColumns Guard Fix

Layer / File(s)	Summary
PackedColumns null check python/cudf_streaming/cudf_streaming/partition_utils.pyx	Changes the non-empty PackedColumns guard to use packed_columns.c_obj.get() != NULL before releasing metadata and gpu_data.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• rapidsai/cudf#22352: Modifies Sphinx configuration in docs/cudf/source/conf.py, including html_theme and theme-related navigation settings.

Suggested labels

improvement

Suggested reviewers

• wence-
• rjzamora
• madsbk

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: switching the docs to the NVIDIA Sphinx theme.
Description check	✅ Passed	The description directly matches the changeset and covers the theme switch, dependency updates, and removal of custom CSS/JS.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[vyasr]

Couple of questions about simplifying and documenting the jinja template we're adding, but otherwise looks great. Thanks for figuring this out Bradley!

[bdice]

/merge