WIP Demo apps redesign with theme switcher

[adamkudrna]

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[netlify]

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Lighthouse	1 paths audited Performance: 95 (🔴 down 1 from production) Accessibility: 91 (🔴 down 2 from production) Best Practices: 100 (no change from production) SEO: 83 (🟢 up 1 from production) PWA: - View the detailed breakdown and full score reports

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[adamkudrna]

Closing in favour of #1666 😈