docs: add Homebrew install to quickstart

[Krishan27]

Adds Homebrew install section (brew tap flaglint/tap + brew install flaglint) to the quickstart page. Updates Requirements to note Node.js is only needed for the npm path.

[cloudflare-workers-and-pages]

Deploying flaglint with    Cloudflare Pages

Latest commit:	ff459c3
Status:	✅  Deploy successful!
Preview URL:	https://5545a931.flaglint.pages.dev
Branch Preview URL:	https://docs-add-homebrew-install.flaglint.pages.dev

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📥 Commits

Reviewing files that changed from the base of the PR and between d9cc35f and ff459c3.

📒 Files selected for processing (3)

• src/content/docs/docs/guides/launchdarkly-to-openfeature-nodejs.md
• src/content/docs/docs/quickstart.md
• src/pages/index.astro

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/add-homebrew-install

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