set basic layout. adding status bar

bower_components/bootstrap/site/_includes/callout-info-mediaqueries-breakpoints.md

@@ -0,0 +1,4 @@
+{% capture callout %}
+Note that since browsers do not currently support [range context queries](https://www.w3.org/TR/mediaqueries-4/#range-context), we work around the limitations of [`min-` and `max-` prefixes](https://www.w3.org/TR/mediaqueries-4/#mq-min-max) and viewports with fractional widths (which can occur under certain conditions on high-dpi devices, for instance) by using values with higher precision for these comparisons.
+{% endcapture %}
+{% include callout.html content=callout type="info" %}