Update docs to use NVIDIA Sphinx theme

[bdice]

Description

Updates the Sphinx documentation to use nvidia_sphinx_theme with the theme's default left navigation.

This replaces the previous Sphinx theme dependency, removes the legacy shared RAPIDS CSS/JavaScript injection where present, and regenerates dependency manifests.

Contributes to rapidsai/build-planning#300.

Validation

• Commit-time pre-commit hooks passed, including generated dependency files.
• sphinx-build -E -b dirhtml . _html -W and sphinx-build -E -b text . _text -W passed in a dedicated docs environment.
• Rendered HTML loads the NVIDIA theme, uses the default left navigation, and contains no legacy shared RAPIDS asset URLs.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.
• The cmake-format.json is up to date with these changes.
• I have added new files under rapids-cmake/
  • I have added include guards (include_guard(GLOBAL))
  • I have added the associated docs/ rst file and update the api.rst

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[bdice]

Rendered from e6b2870f.

Main page

API reference

[robertmaynard]

Looks great, thanks