themes/hyde: Exclude pages without date from main loop

This allows having standalone pages at the top level without them showing up in the blog post list

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

themes/hyde/layouts/index.html

@@ -1,6 +1,7 @@
 {{ define "main" -}}
 <div class="posts">
 {{ range .Site.RegularPages -}}
+{{ if .Date }}
 <article class="post">
   <h1 class="post-title">
     <a href="{{ .Permalink }}">{{ .Title }}</a>
@@ -16,3 +17,4 @@
 {{- end }}
 </div>
 {{- end }}
+{{- end }}