handle csnx storybooks from central storybooks app

[sndrs]

What are you changing?

• all storybooks are built/managed by apps/storybooks
• typescript imports of react explicitly point to "./node_modules/@types/react"
  • thanks to https://github.com/pnpm/pnpm/issues/7158#issuecomment-1783974123
• reverts bump of @guardian/ packages peerdep on @types/react which was only there to get storybook working (no longer needed so we can avoid a major bump for consumers)

Why?

keeps the storybook env discreet from the package development environments, meaning we can run storybook in different versions of e.g. react than we develop in. this is a more realistic use of the library.

Co-authored-by: @oliverabrahams