docs: switch over to fern

[willkill07]

Overview

Switch the documentation site from Sphinx to Fern and migrate the docs content, navigation, and API reference generation to the Fern structure.

• I confirm this contribution is my own work, or I have the right to submit it under this project's license.
• I searched existing issues and open pull requests, and this does not duplicate existing work.

Details

• Adds Fern site configuration, NVIDIA assets, shared Fern components, and site styling.
• Migrates docs pages from the previous Markdown/Sphinx layout to MDX/Fern paths, including getting started, concepts, integrations, plugin docs, reference, resources, and troubleshooting content.
• Replaces Sphinx-oriented API reference generation with Fern-friendly Python, Node.js, and Rust reference generation scripts.
• Updates docs build scripts, CI docs workflows, path filters, pre-commit hooks, package metadata, lockfiles, attributions, and contribution/release guidance for the Fern workflow.
• Validated with just docs, just docs-linkcheck, and uv run pre-commit run --all-files; the Fern checks pass with one light-mode accent contrast warning reported by Fern.

Where should the reviewer start?

Start with fern/docs.yml and scripts/build-docs.sh to understand the new docs entry points and navigation, then sample the migration pattern in docs/index.yml and docs/getting-started/quick-start/index.mdx.

Related Issues: (use one of the action keywords Closes / Fixes / Resolves / Relates to)

• Relates to [Epic]: Switch to Fern for Documentation #71

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