Revert "feat: custom server entry points during development"

[teemingc]

Reverts #16464

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 35f3369:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/35f33692669ee253da9320664e4113c57a92e012

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16586

[changeset-bot]

⚠️ No Changeset found

Latest commit: 35f3369

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-16586-svelte.vercel.app/

[Rich-Harris]

Context, for posterity: we realized that it's more useful to be able to add this sort of logic as Vite middleware