New: Instance name for Page Title

frontend/src/App/App.js

@@ -8,7 +8,7 @@ import AppRoutes from './AppRoutes';
 
 function App({ store, history }) {
   return (
-    <DocumentTitle title="Radarr">
+    <DocumentTitle title={window.Radarr.instanceName}>
       <Provider store={store}>
         <ConnectedRouter history={history}>
           <PageConnector>

frontend/src/Components/Page/PageContent.js

@@ -14,7 +14,7 @@ function PageContent(props) {
 
   return (
     <ErrorBoundary errorComponent={PageContentError}>
-      <DocumentTitle title={title ? `${title} - Radarr` : 'Radarr'}>
+      <DocumentTitle title={title ? `${title} - ${window.Radarr.instanceName}` : window.Radarr.instanceName}>
         <div className={className}>
           {children}
         </div>