docs: announce repository move

[polarweasel]

Adds pre-move notices to the README and documentation landing page for the September 4, 2026 transfer of NICo from NVIDIA/infra-controller to dsx-ai-factory/infra-controller. Infrastructure and canonical-link updates are intentionally deferred to cutover day.

(This is a redo of @deepak-poornachandra's #5466 that had some commit signing issues.)

Related Issues

N/A

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
• Remove - Removed features or deprecated functionality
• Internal - Internal changes (refactoring, tests, docs, etc.)

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• No testing required (docs, internal refactor, etc.)

Additional Notes

N/A

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 77355c5 and 962b7c0.

📒 Files selected for processing (4)

• README.md
• docs/index.md
• fern/docs.yml
• fern/fern.config.json

🚧 Files skipped from review as they are similar to previous changes (4)

• fern/fern.config.json
• README.md
• fern/docs.yml
• docs/index.md

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Summary by CodeRabbit

• Documentation
  • Added notices about the repository moving to a new location on September 4, 2026.
  • Documented expected URL and Git operation redirects, plus guidance for updating automation and integration references.
  • Added the announcement to the documentation site and enabled canonical host metadata for improved discoverability.
• Chores
  • Updated the documentation tooling configuration to the latest version.

Walkthrough

The change documents the planned repository move to dsx-ai-factory/infra-controller on September 4, 2026. It also updates the documentation site configuration and Fern version.

Changes

Repository relocation

Layer / File(s)	Summary
Repository relocation notices README.md, docs/index.md, fern/docs.yml	Adds relocation notices with the move date, redirect behavior, Git compatibility, and required integration updates.
Documentation configuration fern/docs.yml, fern/fern.config.json	Enables canonical host metadata and updates Fern from 5.94.0 to 5.108.0.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 962b7

This PR adds repository-move notices and related documentation metadata without introducing an actionable merge-blocking risk; it is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description accurately summarizes the repository move notices, the September 4, 2026 cutover, deferred infrastructure updates, and documentation-only scope.
Title check	✅ Passed	The title clearly and concisely identifies the primary change: announcing the repository move in documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (4 skipped: 4 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

🌿 Preview your docs: https://nvidia-preview-pull-request-5543.docs.buildwithfern.com/infra-controller

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[Sinck]

Previously this was commented out. Is that important?

[polarweasel]

It's an SEO thing. That host should be the default anyway, but I figured belt-and-suspenders can't hurt.