refactor: split homepage component boundaries

[jderochervlk]

Context

Make the homepage easier to optimize incrementally by giving each section a focused module and removing eager module work. This is the second PR in #1359 and depends on #1355.

Changes

• split the seven homepage sections into private ReScript component modules
• remove the unused MarkdownComponents prop and its homepage dependency edge
• replace static useState and module-scope JSX with immutable data and render-time elements
• ratchet the measured homepage budgets after the refactor

Measured impact

• initial JavaScript requests: 21 to 20
• initial JavaScript gzip: 284,515 to 279,510 bytes
• initial CSS: 80,247 to 80,205 raw bytes
• DOM and media counts unchanged

Raw JavaScript increases by 12,287 bytes because React Router expands its highly compressible generated manifest for the changed chunk graph; transferred gzip size falls by 5,005 bytes overall.

Relates to #1354.

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-18T12:43:32.371671Z	de5d1c9	Manual request

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Codex Review: Didn't find any major issues. Keep it up!

Reviewed commit: de5d1c9698

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Lighthouse baseline

Compared with target branch test/homepage-performance-guardrails at commit 542a28f. Scores are the median of 3 runs against the deployed Cloudflare preview.

Category	Target	Current	Change
Performance	83	80	-3
Accessibility	74	74	0
Best practices	100	100	0
SEO	50	50	0

Download the full Lighthouse reports and baseline

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Guide Cloudflare deployment

⛅️ wrangler 4.130.0
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🌀 Building list of assets...
✨ Read 17 files from the assets directory /home/runner/work/rescript-lang.org/rescript-lang.org/apps/guide/build/client
🌀 Starting asset upload...
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Version Preview Alias URL: https://refactor-homepage-components-guide.rescript.workers.dev

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Cloudflare deployment

Deployement ID: 729b4da2-02d5-4a5a-86ac-f2d8348514e3
Deployment Environment: preview

⛅️ wrangler 4.130.0
────────────────────
✨ Compiled Worker successfully
Uploading... (8881/8882)
Uploading... (8882/8882)
✨ Success! Uploaded 1 files (8881 already uploaded) (1.38 sec)

✨ Uploading _redirects
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✨ Deployment alias URL: https://refactor-homepage-components.rescript-lang.pages.dev

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Docs preview