Order post excerpts on homepage

layouts/index.html

+{{ define "main" -}}
+<div class="posts">
+{{ range .Data.Pages.ByDate -}}
+<article class="post">
+  <h1 class="post-title">
+    <a href="{{ .Permalink }}">{{ .Title }}</a>
+  </h1>
+  <time datetime="{{ .Date.Format "2006-01-02T15:04:05Z0700" }}" class="post-date">{{ .Date.Format "Mon, Jan 2, 2006" }}</time>
+  {{ .Summary }}
+  {{ if .Truncated }}
+  <div class="read-more-link">
+    <a href="{{ .RelPermalink }}">Read More…</a>
+  </div>
+  {{ end }}
+</article>
+{{- end }}
+</div>
+{{- end }}