docs: improve storybook entry

[kimon-satan]

How to review this PR

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• 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
  • Code duplication (via not using base components)
  • Non-functional storybook for this or related components
  • Sensitve files changed eg. atoms, or style tokens
  • Relative imports
  • Default exports

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A styled wrapper for OakPupilJourneyListItems

Link to the design doc

https://www.figma.com/file/zqpeecgzMGKRli2gUdJOLp/Pupil-Browse?type=design&node-id=4261%3A38039&mode=dev

A link to the component in the deployment preview

https://deploy-preview-161--lively-meringue-8ebd43.netlify.app/?path=/docs/components-organisms-pupil-oakpupiljourneylist--docs

ACs

[x] Renders children with correct styling
[x] Switches colour according to phase prop

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