docs: explain macOS PATH activation

[yassinsolim]

Summary

• explain that the recommended macOS shell installer updates the user's shell profile
• tell users to open a new terminal for the updated PATH to take effect
• document source ~/.zshrc for immediate use in the current zsh session

This complements spicetify/cli#3903, which improves the installer's completion message.

Verification

• bun run format:check
• bun run lint
• bun run build
• rendered the Getting Started page and confirmed the note appears under macOS → Shell Script

Summary by CodeRabbit

• Documentation
  • Added macOS installation guidance explaining how to apply the updated PATH.
  • Instructed users to open a new terminal or reload their shell profile after installation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 82406764-934a-47c2-874b-6bfb1d471709

📥 Commits

Reviewing files that changed from the base of the PR and between d38162a and 597a2da.

📒 Files selected for processing (1)

• src/content/docs/getting-started.mdx

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Walkthrough

The getting-started guide adds a macOS installation note. The note explains the shell-profile update and shows how to apply the updated PATH.

Changes

macOS installation documentation

Layer / File(s)	Summary
Shell profile activation instructions src/content/docs/getting-started.mdx	The guide explains that the macOS installer updates the shell profile. It instructs readers to open a new terminal or source ~/.zshrc.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A rabbit reads the setup page,
“New shell steps!” I softly say.
Open a terminal fresh and bright,
Or source .zshrc to set things right.
The PATH now hops into the day.

🚥 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 describes the macOS documentation change about activating the updated PATH.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[yassinsolim]

Hi @afonsojramos — when you have a chance, would you mind reviewing this small macOS Getting Started clarification? It complements spicetify/cli#3903. Thanks!