refactor: item tile headers

layouts/partials/text/item-title.html

@@ -0,0 +1,21 @@
+{{- /*
+  Displays an itemtitle with optional subtitle.
+
+  @params pc    Page context.
+  @params sc  Site context.
+  @params class The base of the element CSS class.
+  */
+-}}
+
+
+<hgroup
+  class="p-name"
+  itemprop="name"
+>
+  <h2 class="{{ .class }}__title {{ if gt ( len ( .pc.Title | plainify ) ) 40 }}{{ .class }}__title--long{{ end }}">
+    {{- default .pc.Title .pc.Params.markup_title  | .pc.Page.RenderString -}}
+  </h2>
+  {{ with .pc.Params.subtitle }}
+    <p class="{{ $.class }}__subtitle">{{ . | $.pc.Page.RenderString }}</p>
+  {{ end }}
+</hgroup>