Make taxonomy layouts work with new system.

layouts/taxonomy-summary.html

@@ -0,0 +1,4 @@
+<article class="list-view{{ with .Section }} list-view--{{ . | urlize }}{{ end }}">
+<h2 class="title"><a href="{{ .RelPermalink }}">{{ .Title }}</a> <span class="meta">({{ .Data.Pages.Len }})</span></h2>
+{{ with .Description }}<p>{{ . }}</p>{{ end }}
+</article>

layouts/taxonomy.html

@@ -0,0 +1,13 @@
+{{ define "main" -}}
+<main class="main layout__main">
+<header>
+<h1 class="title">{{ .Title }}</h1>
+</header>
+
+{{ .Content }}
+
+{{ range .Pages.ByTitle -}}
+{{ .Render "taxonomy-summary" }}
+{{ end -}}
+</main>
+{{ end -}}