add payment route + additional starting blocks

src/routes/(main)/+layout.server.ts

@@ -1,4 +1,6 @@
 import { get_username } from '$lib/js/get_username';;
+import type { Actions, PageServerLoad } from "./$types"
+import { error } from "@sveltejs/kit"
 
 export const load = (async ({cookies}) => {
 	return { user: await get_username(cookies) }