new headers, ad placements, intro paragraphs on several pages, etc

docs/components/page-header.md

@@ -5,6 +5,8 @@ title: Page header
 
 A simple shell for an `h1` to appropriately space out and segment sections of content on a page. It can utilize the `h1`'s default `small` element, as well as most other components (with additional styles).
 
+## Example
+
 {% example html %}
 <div class="page-header">
   <h1>Example page header <small>Subtext for header</small></h1>