chore: add docs/ dir which links to official docs site

[cdesiniotis]

Description

This addresses SIG-DOC-02 from OSS Scorecard.

Checklist

• No secrets, sensitive information, or unrelated changes
• Lint checks passing (make lint)
• Generated assets in-sync (make validate-generated-assets)
• Go mod artifacts in-sync (make validate-modules)
• Test cases are added for new code paths

Testing

OSS Scorecard was run before and after this change.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: QUIET

Plan: Enterprise

Run ID: f0982ec5-1757-465a-89cb-2c396866f9d6

📥 Commits

Reviewing files that changed from the base of the PR and between 08c40bc and 8deed4c.

📒 Files selected for processing (1)

• docs/README.md

Included review availability: Your plan provides up to 12 included reviews per hour; 10 remain after this review.

---

📝 Walkthrough

Walkthrough

The documentation README adds links to the official NVIDIA GPU Operator documentation and the documentation repository for questions or issues.

Merge Risk: ⚪ Minimal · up to 8deed

This adds links to the official GPU Operator documentation and issue tracker without affecting product behavior or deployment.

---

_{Comment @coderabbitai help to get the list of available commands.}

[tariq1890]

Can we also add a line in the CONTRIBUTING.md document pointing users to the cloud-native-docs repo? We could add the line under this section.