Migrate SvelteKit to the latest version 431 (#526)

web/src/routes/+page.ts

@@ -0,0 +1,21 @@
+export const prerender = false;
+import { redirect } from '@sveltejs/kit';
+import { api } from '@api';
+import { browser } from '$app/env';
+import type { PageLoad } from './$types';
+import { goto } from '$app/navigation';
+
+export const load: PageLoad = async ({ parent }) => {
+	const { user } = await parent();
+	if (user) {
+		throw redirect(302, '/photos');
+	}
+
+	if (browser) {
+		const { data } = await api.userApi.getUserCount();
+
+		return {
+			isAdminUserExist: data.userCount != 0
+		};
+	}
+};