feat(PUPIL-204): update drag and drop instructions

[carlmw]

How to review this PR

• Check component hierarchy is followed correctly
• Check the design Heuristics have been followed
• Check naming conventions have been applied
• Check for these gotchyas:
  • Missing exports for Oak components
  • Accidental export of Internal components
  • Snapshots of unexpected components have been modified
  • Circular dependencies
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  • Sensitve files changed eg. atoms, or style tokens
  • Relative imports
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instructions are more terse and no longer tailored to the detected input method.

Link to the design doc

https://www.figma.com/file/G7z5ufo2T0CHk14CkadeuB/Pupils-high-fidelity-designs?type=design&node-id=6942-116693&mode=design&t=9LOLhTBVKlvMIA6t-4

A link to the component in the deployment preview

https://deploy-preview-128--lively-meringue-8ebd43.netlify.app/?path=/docs/components-molecules-oakdraganddropinstructions--docs

Before

Desktop/keyboard

Tablet/mobile/touch

After

[notion-workspace]

✏️ OWA Order Question

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[benprotheroe]

LGTM