docs: link DGX Spark setup guide from README

[ericksoa]

Closes #321.

Summary

• Add a tip box before the install section directing DGX Spark users to spark-install.md

Problem

Spark users following the main Quick Start hit opaque errors because Spark-specific prerequisites (cgroup v2, Docker configuration) are only documented in spark-install.md, which the README never links to.

Summary by CodeRabbit

• Documentation
  • Added a callout in the "Container Runtime Support" section advising DGX Spark users to complete the Spark setup guide before running the standard installer, and calling out Spark-specific prerequisites (e.g., cgroup v2 and Docker configuration). No other installation instructions or documentation structure were changed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4b864962-dc2a-4a05-9de1-e9a60b6f1084

📥 Commits

Reviewing files that changed from the base of the PR and between a601d45 and 581ca28.

📒 Files selected for processing (1)

• README.md

✅ Files skipped from review due to trivial changes (1)

• README.md

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📝 Walkthrough

Walkthrough

The README.md now includes an inline tip in the "Container Runtime Support" section advising DGX Spark users to consult spark-install.md before running the standard installer, noting Spark-specific prerequisites (e.g., cgroup v2 and Docker configuration).

Changes

Cohort / File(s)	Summary
Documentation Update README.md	Added an inline tip under "Container Runtime Support" directing DGX Spark users to follow spark-install.md (Spark-specific prerequisites) before running the standard installer.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A tiny footnote hops into view,
"Spark users, check spark-install first!" — it's true.
A nudge for cgroups and Docker to align,
So installations hum and errors decline. ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding a link to the DGX Spark setup guide from the README, which directly addresses the PR's primary objective.
Linked Issues check	✅ Passed	The PR fully addresses issue #321 by adding a callout tip linking DGX Spark users to spark-install.md from the README, making Spark-specific prerequisites discoverable and preventing users from encountering opaque errors.
Out of Scope Changes check	✅ Passed	All changes are in-scope: only a callout tip was added to the README to link to spark-install.md. No extraneous modifications or unrelated changes are present.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-321-readme-spark-link

📝 Coding Plan

• Generate coding plan for human review comments

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