Testing updates

[cifarquhar]

WIP - DO NOT MERGE

Latest changes to the ITP module. This extends and rearranges testing content.

• Sprint 1 - Playing computer, intro to testing, anonymous & arrow functions
• Sprint 2 - Package management, testing using Jest, TDD
• Sprint 3 - Git CLI, introducing REPLs

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[netlify]

✅ Deploy Preview for cyf-curriculum ready!

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🔨 Latest commit	97de85d
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Lighthouse	1 paths audited Performance: 90 (🟢 up 1 from production) Accessibility: 100 (no change from production) Best Practices: 92 (no change from production) SEO: 100 (no change from production) PWA: - View the detailed breakdown and full score reports
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