themes/hyde: Use Description field to summarize pages in main list

Signed-off-by: Harsh Shandilya <msfjarvis@gmail.com>

themes/hyde/layouts/index.html

@@ -7,7 +7,7 @@
     <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 }}
+  {{ .Description }}
   {{ if .Truncated }}
   <div class="read-more-link">
     <a href="{{ .RelPermalink }}">Read More…</a>