Update env.d.ts

[huseeiin]

set START_SSR, START_ISLANDS, START_DEV_OVERLAY to boolean to match runtime
those values were set to string in TS but are booleans in runtime.

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🦋 Changeset detected

Latest commit: 59e2e85

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

This PR includes changesets to release 1 package

Name	Type
@solidjs/start	Patch

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pnpm add https://pkg.pr.new/@solidjs/start@1621

commit: 59e2e85