docs: migrate documentation from Sphinx to Fern

[lbliii]

Summary

Migrates the docs/ Sphinx/MyST documentation to Fern MDX, targeting the current main (0.3.0) history. This is a fresh re-point of #1032 — that PR was built on main-legacy, whose docs document the old nemo-evaluator-launcher CLI; importing it would pollute main with stale content. Instead, this PR re-runs the migration against main's current docs (the new nel CLI) so the content matches the shipping product.

Generated with the convert-to-fern toolkit.

What changed

• Fern scaffolding under docs/fern/: fern.config.json (pinned to fern-api 5.29.0, matching NeMo-Curator), docs.yml with the NVIDIA global-theme, MDX components, and an explicit-slug nightly navigation.
• All 29 doc pages converted to MDX at docs/<section>/*.mdx, with frontmatter and version-agnostic internal links.
• Fern CI workflows (fern-docs-ci, fern-docs-preview-build, fern-docs-preview-comment, publish-fern-docs), rooted at docs/fern.
• Sphinx removed: conf.py, requirements.txt, versions1.json, broken_links_false_positives.json, the release-docs / release-nightly-docs workflows, the Sphinx docs-version bump in release-freeze, the Sphinx [docs] extra, and the Makefile sphinx targets (now fern check / fern docs dev).

Validation

Both pass locally with the CI-pinned fern-api@5.29.0:

• fern check → All checks passed
• fern docs broken-links → ✓ All checks passed (every internal link resolves)
• Toolkit checks clean: no tag mismatches, no unconverted MyST/RST artifacts.

Note: global-theme: nvidia resolves against the Fern registry, so it validates in CI (which has DOCS_FERN_TOKEN) and for any local run authenticated to the nvidia Fern org.

Supersedes #1032.

🤖 Generated with Claude Code

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Important

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