remove transformPage

Author: Rich-Harris

packages/kit/src/core/build/build_server.js

@@ -89,7 +89,6 @@ export class App {
 			root,
 			service_worker: ${has_service_worker ? "base + '/service-worker.js'" : 'null'},
 			router: ${s(config.kit.browser.router)},
-			transformPage: ({ html }) => html,
 			template,
 			template_contains_nonce: ${template.includes('%svelte.nonce%')},
 			trailing_slash: ${s(config.kit.trailingSlash)}