Performance: Update images for performance benefits

[mahoneycm]

Summary

• Replaces jpg images with webp
• Removes unused images from repo
• Adds lazy loading attribute

Performance

• Pre patch: 72
• With fix: 90

Related issues

Resolves #41 Resolves #37

[netlify[bot]]

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Lighthouse	1 paths audited Performance: 90 Accessibility: 65 Best Practices: 92 SEO: 75 PWA: - View the detailed breakdown and full score reports

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