Migrate SvelteKit to the latest version 431 (#526)

web/src/routes/auth/register/+page.server.ts

@@ -0,0 +1,13 @@
+import { redirect } from '@sveltejs/kit';
+import type { PageServerLoad } from './$types';
+import { serverApi } from '@api';
+
+export const load: PageServerLoad = async () => {
+	const { data } = await serverApi.userApi.getUserCount();
+	if (data.userCount != 0) {
+		// Admin has been registered, redirect to login
+		throw redirect(302, '/auth/login');
+	}
+
+	return;
+};