Align RMM documentation branding

[bdice]

Description

• uses NVIDIA RMM for the documentation project and landing-page branding
• removes the inactive Twitter/X icon
• uses NVIDIA RMM Documentation consistently for HTML, LaTeX, man, and Texinfo output
• retains the GitHub icon and NVIDIA theme defaults

Follow-up to rapidsai/build-planning#300 and #2443.

Validation

• Doxygen generation passes
• strict Sphinx HTML build passes with -n -W --keep-going
• 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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[coderabbitai]

📝 Walkthrough

Walkthrough

The Sphinx documentation configuration now uses NVIDIA RMM branding in generated titles, removes the X icon link, and updates the documentation index heading to match.

Changes

Documentation branding update

Layer / File(s)	Summary
Update Sphinx branding and titles docs/conf.py	The project variable changes to NVIDIA RMM, the X icon link is removed, and the LaTeX, man page, and Texinfo titles now use the project name.
Update docs index heading docs/index.md	The documentation landing page title and intro line are updated to NVIDIA RMM branding.

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

Possibly related PRs

• rapidsai/rmm#2443: Both PRs modify docs/conf.py and related Sphinx configuration.

Suggested labels: doc, non-breaking

Suggested reviewers: msarahan, gforsyth

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly matches the main change: updating RMM documentation branding to NVIDIA RMM.
Description check	✅ Passed	The description accurately matches the documentation branding and icon-link changes in the PR.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[bdice]

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