Fix list.html partial: restore page block

This was accidentally broken in "Define Base Template (baseof.html)" (896326481e)

layouts/_default/list.html

@@ -1,5 +1,11 @@
 {{ define "main" }}
 	<main class="main">
+		{{- if or .Title .Content }}
+		<div class="page block">
+			{{ with .Title }}<h1 class="page__title">{{ . }}</h1>{{ end }}
+			{{ with .Content }}<div class="page__content{{ if not $.Title }} page__content--notitle{{ end }}">{{ . }}</div>{{ end }}
+		</div>
+		{{- end }}
 		<div class="cards">
 			{{ range .Paginator.Pages }}
 				<div class="card{{ if $.Param "cardsPerRow" }} card--{{ $.Param "cardsPerRow" }}col{{ else }} card--2col{{ end }}">