Align cuDF documentation branding

[bdice]

Description

• uses NVIDIA cuDF for the documentation project and landing-page branding
• removes the inactive Twitter/X link and retains the GitHub icon
• removes the RAPIDS logo from the landing page so the theme default NVIDIA logo is used
• uses NVIDIA cuDF Documentation consistently for HTML, LaTeX, man, and Texinfo output

Follow-up to rapidsai/build-planning#300 and #23035.

Validation

• Doxygen generation passes
• strict Sphinx HTML build passes with -n -W --keep-going and notebook execution disabled
• the notebook-executing build reaches HTML rendering but the 10min notebook fails with an unrelated CUDA_ERROR_ILLEGAL_ADDRESS in the local GPU environment
• targeted pre-commit hooks pass

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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[bdice]

Rendered from ecde1957.

Main page

API reference

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between ca1439c and ecde195.

📒 Files selected for processing (3)

• docs/cudf/source/conf.py
• docs/cudf/source/index.rst
• docs/dask_cudf/source/conf.py

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📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Updated documentation branding to use NVIDIA product names for cuDF and Dask-cuDF.
  • Refreshed the documentation landing page title to match the new naming.
  • Standardized generated documentation titles across HTML, PDF, man pages, and texinfo outputs.
  • Removed an outdated social link from the documentation theme.

Walkthrough

Updates Sphinx documentation configuration for cuDF and Dask-cuDF: project names changed to "NVIDIA cuDF" and "NVIDIA Dask-cuDF", document titles now derive from the project variable, twitter_url removed from theme options, and cuDF index page header updated.

Changes

Docs Branding Update

Layer / File(s)	Summary
cuDF Sphinx config and landing page docs/cudf/source/conf.py, docs/cudf/source/index.rst	Project renamed to "NVIDIA cuDF", latex/man/texinfo titles now use f"{project} Documentation", twitter_url removed from html_theme_options, and index.rst header replaced with "NVIDIA cuDF Documentation".
Dask-cuDF Sphinx config docs/dask_cudf/source/conf.py	Project renamed to "NVIDIA Dask-cuDF" and twitter_url removed from html_theme_options.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested labels: doc, non-breaking

Suggested reviewers: msarahan, simoneves, vyasr

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: updating cuDF documentation branding.
Description check	✅ Passed	The description directly matches the branding and documentation output updates in the changeset.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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[bdice]

/merge