feat: display feature status (#745)

* feat: display feature status

* fix: hook dep

* fix: react hooks dep

app/assets/javascripts/hooks/manageSubscription.ts

@@ -0,0 +1,12 @@
+import { SNApplication } from '@standardnotes/snjs';
+
+export function openSubscriptionDashboard(application: SNApplication): void {
+  application.getNewSubscriptionToken().then((token) => {
+    if (!token) {
+      return;
+    }
+    window.open(
+      `${window._dashboard_url}?subscription_token=${token}`
+    );
+  });
+}