Publishing updates

[zredeaux07]

Made the following changes:

• Updated Sphinx HTML theme and options
• Added initial release notes
• Added release notes to documentation

[greptile-apps]

Greptile Summary

The PR updates the documentation publishing configuration to use NVIDIA’s Sphinx theme and adds initial release and archive content.

• Installs the new theme and Markdown documentation dependencies in CI.
• Configures the version switcher, Transformer Engine repository link, and static theme assets.
• Adds Markdown release notes, an archive page, and version-switcher metadata.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/docs.yml	Installs the NVIDIA theme and MyST dependencies before running the warning-as-error Sphinx build.
docs/conf.py	Configures the NVIDIA theme, Markdown parsing, version switcher, repository link, and existing extra-path metadata.
docs/index.rst	Adds the existing Markdown release-notes document to the Getting Started toctree.
docs/release_notes.md	Adds the initial release-notes template consumed through MyST.
docs/versions1.json	Defines switcher entries for the latest documentation and release archive.

_{Reviews (5): Last reviewed commit: "Add copyright to documentation-archive.r..." | Re-trigger Greptile}

[greptile-apps]

Theme extension name cannot import

When CI, nightly publishing, or a local Sphinx build loads this configuration, Sphinx attempts to import the hyphenated nvidia-sphinx-theme extension name and aborts before generating HTML. The documentation environment also does not install the newly selected theme, so the attempted fix leaves the unavailable-theme build failure in place.