[create-cloudflare] Remove custom prettier config

[penalosa]

Removes the custom .prettierrc in packages/create-cloudflare/ and reformats C3 to use the monorepo's shared prettier config. This was the only package with its own prettier overrides (custom printWidth, @ianvs/prettier-plugin-sort-imports).

Follows up on #12939 which updated prettier to 3.8.1.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: formatting-only change
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal tooling change

---

[changeset-bot]

⚠️ No Changeset found

Latest commit: 241fdc2

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[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[pkg-pr-new]

create-cloudflare

npm i https://pkg.pr.new/create-cloudflare@12940

@cloudflare/kv-asset-handler

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miniflare

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@cloudflare/pages-shared

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@cloudflare/unenv-preset

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@cloudflare/vite-plugin

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@cloudflare/vitest-pool-workers

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@cloudflare/workers-editor-shared

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wrangler

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commit: 241fdc2

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.

[dario-piotrowicz]

LGTM 🙂