Update SolidStart template to modify Vite config

[jamesopstad]

Update SolidStart template for compatibility with v2.

SolidStart v2 uses the nitro Vite plugin so we now update the Nitro config in vite.config.ts rather than app.config.ts.

Note that Nitro automatically populates the main and assets fields in the output Wrangler config file.

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

A picture of a cute animal (not mandatory, but encouraged)

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6f86956

The changes in this PR will be included in the next version bump.

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[pkg-pr-new]

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@cloudflare/kv-asset-handler

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@cloudflare/workers-editor-shared

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wrangler

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commit: a0f8622

[github-actions]

✅ All changesets look good

[devin-ai-integration]

✅ Devin Review: No Issues Found

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View in Devin Review to see 4 additional findings.

[devin-ai-integration]

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