Remove PE84 promo banner from homepage

[MaxGhenis]

Summary

• remove the temporary PE84 banner from the country homepage
• restore the normal homepage flow so the shared header sits directly above the hero

Testing

• bun run --filter=@policyengine/website build:next

[vercel]

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Project	Deployment	Actions	Updated (UTC)
policyengine-app-v2	Ready	Preview, Comment	Apr 3, 2026 9:40am
policyengine-calculator	Ready	Preview, Comment	Apr 3, 2026 9:40am
policyengine-website	Ready	Preview, Comment	Apr 3, 2026 9:40am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
policyengine-calculator-next	Skipped		Apr 3, 2026 9:40am

[policyengine]

The PR successfully removes the PE84 banner from the homepage. The change is minimal and correct:

✅ Removed the import and usage of <PE84Banner /> from the homepage
✅ HeroSection now appears first, restoring the normal flow
✅ No other references to PE84Banner in the codebase (besides the banner file itself)

Minor suggestion (non-blocking): The website/src/components/home/PE84Banner.tsx file still exists but is now unused. Consider deleting it in a follow-up to clean up dead code. The PE84 page itself (/pe84) is intentionally kept, which is correct.

The build command mentioned in the PR description should work fine since this is a straightforward removal with no logic changes.