Add note for older macOS Nix installation

[vorburger]

Added a note about using the Universal graphical installer for older macOS versions, because the curl CLI fails at least on some Mac, because it tries to fetch https://install.determinate.systems/nix/tag/v3.13.2/nix-installer-x86_64-darwin which does not exist.

Summary by CodeRabbit

• Documentation
  • Enhanced installation guidance with fallback instructions for older macOS versions. Users encountering installer command failures are now directed to the Universal graphical installer, providing clearer support options and improving the overall installation experience.

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[coderabbitai]

Walkthrough

Adds fallback guidance to documentation for users on older macOS versions. If the installer command fails, users are directed to the Universal graphical installer. No code logic or behavior is modified.

Changes

Cohort / File(s)	Summary
macOS installer guidance src/content/concepts/nix-installer.mdx	Appends a new fallback instruction line directing users on older macOS versions to use the Universal graphical installer if the standard command fails

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Single file with documentation-only changes
• Addition of user-facing guidance text with no logic modifications
• No code or entity signature changes

Poem

A rabbit hops through docs so fair, 🐰
Adding help for those who need repair,
When Nix won't dance on Macs of old,
A graphical path—a story told!
Guidance glows where once was none,
And users smile when help has come. ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding guidance for Nix installation on older macOS versions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (1)

src/content/concepts/nix-installer.mdx (1)

33-33: Verify the fallback URL and convert to a markdown link.

The note directs users to a general docs URL without a specific path. Verify that https://docs.determinate.systems is reachable and clearly documents the Universal graphical installer. Additionally, convert the URL to a markdown link for better user experience.

-If this does not work (e.g. on older macOS versions), then go to https://docs.determinate.systems and use e.g. the _Universal_ graphical installer.
+If this does not work (e.g. on older macOS versions), then go to [https://docs.determinate.systems](https://docs.determinate.systems) and use the _Universal_ graphical installer.

Note: I removed the second "e.g." since the Universal installer appears to be the specific recommendation rather than one of several options.

📜 Review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 155aa01 and d44650b.

📒 Files selected for processing (1)

• src/content/concepts/nix-installer.mdx (1 hunks)