Overhaul networkUtils and expand auth

public/index.html

@@ -15,7 +15,7 @@
   <link rel="icon" type="image/png" href="/assets/logo.png">
   <link rel="icon" type="image/svg+xml" href="/assets/logo.svg">
   <meta name="csrf-token" content="">
-  <meta name="share-url" content="/api/file/share.php">
+  <meta name="share-url" content="">
   <!-- Google Fonts and Material Icons -->
   <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@400;500&display=swap" rel="stylesheet" />
   <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet" />