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="Sonarr">
+    <DocumentTitle title={window.Sonarr.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 ? `${title} - Sonarr` : 'Sonarr'}>
+      <DocumentTitle title={title ? `${title} - ${window.Sonarr.instanceName}` : window.Sonarr.instanceName}>
         <div className={className}>
           {children}
         </div>

src/Sonarr.Http/Frontend/InitializeJsModule.cs

@@ -61,6 +61,7 @@ namespace Sonarr.Http.Frontend
             builder.AppendLine($"  apiKey: '{_apiKey}',");
             builder.AppendLine($"  release: '{BuildInfo.Release}',");
             builder.AppendLine($"  version: '{BuildInfo.Version.ToString()}',");
+            builder.AppendLine($"  instanceName: '{_configFileProvider.InstanceName.ToString()}',");
             builder.AppendLine($"  branch: '{_configFileProvider.Branch.ToLower()}',");
             builder.AppendLine($"  analytics: {_analyticsService.IsEnabled.ToString().ToLowerInvariant()},");
             builder.AppendLine($"  urlBase: '{_urlBase}',");