docs: link to DGX Spark installation guide from Prerequisites

[96528025]

Closes #321

Added a note in the Prerequisites section linking to docs/spark-install.md so DGX Spark users can find the correct setup path without following the main install flow and hitting opaque errors.

Summary by CodeRabbit

• Documentation
  • Added a prerequisite note for DGX Spark users, directing them to follow the dedicated DGX Spark installation guide for setup instructions.

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📥 Commits

Reviewing files that changed from the base of the PR and between 2b5febe and ca42c2e.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

A note has been added to the README's Prerequisites section to direct DGX Spark users to the dedicated Spark installation guide (docs/spark-install.md) instead of following the standard installation steps, addressing the discoverability issue.

Changes

Cohort / File(s)	Summary
Documentation README.md	Added a note under Prerequisites section directing DGX Spark users to follow the Spark installation guide at docs/spark-install.md instead of standard setup steps.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 A little note hops onto the page,
"Dear Spark users, here's your sage!"
To spark-install.md they'll now go,
No more confusion—just a gentle flow!
The README now lights the way,
For DGX Spark users—hip, hip, hooray! 🎉

🚥 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 accurately summarizes the main change: adding a link to the DGX Spark installation guide from the Prerequisites section of the README.
Linked Issues check	✅ Passed	The PR directly addresses issue #321 by adding a note in the Prerequisites section linking to docs/spark-install.md, allowing DGX Spark users to discover the correct setup path.
Out of Scope Changes check	✅ Passed	All changes are scoped to the README.md file and directly address the linked issue requirement to reference the Spark installation guide.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[ericksoa]

Thanks for the contribution! We went with a similar approach in #369 that also explains what the Spark guide covers. Closing this one in favor of that PR — appreciate you jumping on it!