temporarily add trailing slash

Author: Rich-Harris

packages/create-svelte/templates/default/src/routes/about/+page.ts

@@ -1,5 +1,7 @@
 import { dev } from '$app/environment';
 
+export const trailingSlash = 'always';
+
 // we don't need any JS on this page, though we'll load
 // it in dev so that we get hot module replacement
 export const csr = dev;