Add post status administration (#105)

app/javascript/components/shared/SiteSettingsInfoBox.tsx

@@ -0,0 +1,24 @@
+import * as React from 'react';
+
+import Spinner from './Spinner';
+
+interface Props {
+  areUpdating: boolean;
+  error: string;
+}
+
+const SiteSettingsInfoBox = ({ areUpdating, error }: Props) => (
+  <div className="content siteSettingsInfo">
+  {
+    areUpdating ?
+      <Spinner />
+    :
+      error ?
+        <span className="error">An error occurred: {error}</span>
+      :
+        <span>Everything up to date</span>
+  }
+  </div>
+);
+
+export default SiteSettingsInfoBox;