set basic layout. adding status bar

bower_components/bootstrap/site/_includes/callout-info-prefersreducedmotion.md

@@ -0,0 +1,4 @@
+{% capture callout %}
+The animation effect of this component is dependent on the `prefers-reduced-motion` media query. See the [reduced motion section of our accessibility documentation]({{ site.baseurl }}/docs/{{ site.docs_version }}/getting-started/accessibility/#reduced-motion).
+{% endcapture %}
+{% include callout.html content=callout type="info" %}