docs: change prepare to preprepare

[benmccann]

see sveltejs/cli#409. wait until that PR is merged. it is currently blocked on an issue in pnpm

[changeset-bot]

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[Rich-Harris]

preview: https://svelte-dev-git-preview-kit-13337-svelte.vercel.app/

this is an automated message

[teemingc]

Do we need to also update the test suites to use preprepare? Currently, they use prepare.

[benmccann]

Yes, good call. I've updated the test projects now

[Conduitry]

As in sveltejs/cli#409, this will cause issues with npm ci --omit=dev. Once we sort out in that PR how we want to deal with this, we need to update this PR as well.