saving and displaying the configured library dir

frontend/index.html

@@ -7,6 +7,9 @@
     <title>yellowjacket</title>
 </head>
 <script src="./src/main.js" type="module"></script>
+<script>
+    import {GetLibraryDir} from './wailsjs/go/main/App';
+</script>
 
 <body>
     <header class="container">