feat: upgrade homepage images quality

[wackerow]

Description

• Replace portrait homepage images with higher image quality
• Increase desktop image quality setting
• Trim "merge" image edges

Preview link

https://deploy-preview-16675--ethereumorg.netlify.app/

[netlify]

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Lighthouse	7 paths audited Performance: 45 (🔴 down 12 from production) Accessibility: 94 (no change from production) Best Practices: 92 (🔴 down 8 from production) SEO: 92 (no change from production) PWA: 59 (no change from production) View the detailed breakdown and full score reports

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