Fix module path

reader.js

@@ -1,7 +1,7 @@
 import './view.js'
 import { createTOCView } from './ui/tree.js'
 import { createMenu } from './ui/menu.js'
-import { Overlayer } from '../foliate-js/overlayer.js'
+import { Overlayer } from './overlayer.js'
 
 const isZip = async file => {
     const arr = new Uint8Array(await file.slice(0, 4).arrayBuffer())