📖 docs: add cross-reference from users.md to k3d.md

[VignanNallani]

Summary

Adds a cross-reference link in the "Installing on k3d" section of
docs/users.md pointing to the dedicated docs/k3d.md guide.

Problem

Users who find the brief k3d section in users.md have no way to
discover the full k3d documentation page added in PR #676.

Changes

• Added one line in docs/users.md under ### Installing on k3d
  linking to ./k3d.md for the complete setup guide.

Closes #677

[kubestellar-prow]

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[kubestellar-prow]

Hi @VignanNallani. Thanks for your PR.

I'm waiting for a kubestellar member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[VignanNallani]

Closes #677

[Copilot]

Pull request overview

Adds a cross-reference in the k3d installation section of docs/users.md to help users discover the dedicated k3d setup guide.

Changes:

• Added a short sentence/link under “### Installing on k3d” pointing readers to ./k3d.md.

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[VignanNallani]

The docs/k3d.md file is being added in the companion PR #676, which is currently open and awaiting review. This PR is intentionally a follow-up — the link will be valid once #676 is merged. Happy to merge this after #676 if that's preferred.

[VignanNallani]

Hi @clubanderson — small follow-up to PR #676. Adds a cross-reference link so users can discover the full k3d guide from the users.md page. Would appreciate your review!