Render icons inline instead of an icon sprite

[lmestel]

@julrich can you see a performance improvement? #35

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Lighthouse	1 paths audited Performance: 99 (no change from production) Accessibility: 100 (no change from production) Best Practices: 83 (🔴 down 17 from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports

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