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 stack to NVIDIA’s Sphinx theme and adds release notes and version-switching support.

• Installs the NVIDIA theme, MyST parser, and compatible theme dependencies in documentation CI.
• Configures Markdown sources, the corrected Transformer Engine repository link, and a published version-switcher manifest.
• Adds initial release notes and a documentation archive while removing obsolete RTD-theme customizations.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
.github/workflows/docs.yml	Documentation CI now installs the theme and Markdown dependencies required by the updated Sphinx configuration.
docs/conf.py	The theme import, repository link, switcher manifest, and source-suffix configuration now align with the files and dependencies in the PR.
docs/index.rst	The release-notes toctree entry now resolves to the added Markdown document.
docs/versions1.json	The checked-in switcher manifest satisfies the sole html_extra_path entry and defines current and archived documentation destinations.
docs/release_notes.md	Adds the initial Markdown release-notes page consumed by the updated toctree.

_{Reviews (7): Last reviewed commit: "Merge branch 'NVIDIA:main' into zredeaux..." | Re-trigger Greptile}

[ksivaman]

@zredeaux07 Thanks for making the review changes! The generated docs look good to me. @mckimn please take a look at the artifacts.

@zredeaux07 Could you sign-off all your commits to pass the DCO check? Thanks!

[zredeaux07]

signed off on comments.