feat: layout url import

feat: backup import (except chords)
feat: legacy layout import
feat: separate layout, chord & setting backup downloads

src/routes/config/+page.ts

@@ -1,6 +1,8 @@
 import {redirect} from "@sveltejs/kit"
 import type {PageLoad} from "./$types"
 
-export const load = (() => {
-  throw redirect(302, "/config/chords/")
+export const load = (({url}) => {
+  const newUrl = new URL(url)
+  newUrl.pathname = "/config/layout/"
+  throw redirect(302, newUrl)
 }) satisfies PageLoad