Add common CSS and components

[MAILPOET-2677]

assets/js/src/settings/components/label.tsx

@@ -0,0 +1,14 @@
+import React from 'react';
+
+type Props = {
+  title: string
+  description: string
+  htmlFor: string
+}
+
+export default ({ title, description, htmlFor }: Props) => (
+  <div className="mailpoet-settings-label">
+    <label className="mailpoet-settings-label-title" htmlFor={htmlFor}>{title}</label>
+    <p className="description">{description}</p>
+  </div>
+);