Add description to base template

layouts/_default/baseof.html

@@ -4,6 +4,9 @@
     <meta charset="utf-8" />
     <meta http-equiv="x-ua-compatible" content="ie=edge" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    {{ with .Description }}
+    <meta name="description" content="{{ . }}" />
+    {{ end }}
     <title>{{ .Title }} - {{ .Site.Title }}</title>
     {{ $twbssass := resources.Get "styles/mix-twbs.scss" | resources.ToCSS | minify | resources.PostProcess }}
     <link href="{{ $twbssass.Permalink }}" rel="stylesheet" />