refactor: prefer fs.readJSON over readFile.then(JSON.parse)

[Josh-Cena]

Motivation

Makes the code more semantic.

Have you read the Contributing Guidelines on pull requests?

Yes

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	55
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-7186--docusaurus-2.netlify.app/

[github-actions]

Size Change: 0 B

Total Size: 799 kB

ℹ️ View Unchanged

Filename	Size
website/.docusaurus/globalData.json	50 kB
website/build/assets/css/styles.********.css	106 kB
website/build/assets/js/main.********.js	604 kB
website/build/index.html	38.8 kB

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