Invalid _redirects configuration causes infinite loop when deploying to Cloudflare Workers

### What versions & operating system are you using?

**Environment:**
- macOS
- wrangler: ^4.43.0
- slidev (sli.dev)

### Please provide a link to a minimal reproduction

https://github.com/Ankcorn/mcp-tips

### Describe the Bug

**Description:**
When deploying a slidev presentation using `wrangler deploy`, the deployment fails with a Cloudflare API error indicating an infinite redirect loop in the `_redirects` file.

**Root Cause:**
The `_redirects` file generated by slidev contains an invalid rewrite rule:
```
/* /index.html 200
```

I would expect the error message to tell me to delete this file or just handle deploying it

### Please provide any relevant error logs

[ERROR] A request to the Cloudflare API (/accounts/92a369ba0c773e307fbf9b8814730c09/workers/scripts/mcp-tips/versions) failed.

Invalid _redirects configuration:
Line 1: Infinite loop detected in this rule. This would cause a redirect to strip `.html` or
`/index` and end up triggering this rule again. [code: 10021]