feat: side drawer 'Find out more...' content

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What's new in this PR

• Installs react-markdown
• New directory Dashboard/Help/ that stores the drawer content in markdown files, named identically to the cards themselves
• Updates the cards to use the markdown content
  • Some of the cards use string processing and .replace() in order to not hard-code variables
• I also had to move a tiny bit of math out of a constant and into the Lifetime class

Why

• Maintaining separate markdown files with the side drawer content in is easier than dealing with HTML tags etc., thanks to Daf for pattern suggestion

Questions

❓ Is there a tidier way of going about rendering Markdown in the drawer?
❓ Most of this PR is Markdown (which is why there are so many lines), should it be split up into a few smaller ones?

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Name	Status	Preview	Comments	Updated (UTC)
fairhold-dashboard	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 29, 2025 9:53am

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❗ Note to self to update the NHS save help text after the chain of #308, #307 and #300 merges