UI loading improvements

Fixed: Caching for dynamically loaded JS files
Fixed: Incorrect caching of initialize.js
(cherry picked from commit f0cb5b81f140c67fa84162e094cc4e0f3476f5da)

frontend/src/index.ts

@@ -0,0 +1,19 @@
+import './polyfills';
+import 'Styles/globals.css';
+import './index.css';
+
+const initializeUrl = `${
+  window.Prowlarr.urlBase
+}/initialize.json?t=${Date.now()}`;
+const response = await fetch(initializeUrl);
+
+window.Prowlarr = await response.json();
+
+/* eslint-disable no-undef, @typescript-eslint/ban-ts-comment */
+// @ts-ignore 2304
+__webpack_public_path__ = `${window.Prowlarr.urlBase}/`;
+/* eslint-enable no-undef, @typescript-eslint/ban-ts-comment */
+
+const { bootstrap } = await import('./bootstrap');
+
+await bootstrap();