refactor(core): lower timeout before rendering progress bar to 200ms

[Josh-Cena]

Motivation

Close #6290. Because react-loadable sets a default timeout of 200ms, I think this makes more sense. I would agree that 1s sometimes looks like the page is lagging.

Have you read the Contributing Guidelines on pull requests?

Yes

Test Plan

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[github-actions]

⚡️ Lighthouse report for the changes in this PR:

Category	Score
🟠 Performance	61
🟢 Accessibility	100
🟢 Best practices	92
🟢 SEO	100
🟢 PWA	90

Lighthouse ran on https://deploy-preview-7142--docusaurus-2.netlify.app/

[github-actions]

Size Change: -2 B (0%)

Total Size: 797 kB

ℹ️ View Unchanged

Filename	Size	Change
website/.docusaurus/globalData.json	49.9 kB	0 B
website/build/assets/css/styles.********.css	106 kB	0 B
website/build/assets/js/main.********.js	603 kB	-2 B (0%)
website/build/index.html	38.6 kB	0 B

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