layouts/sidebar: bring back description

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

layouts/partials/sidebar.html

@@ -2,6 +2,9 @@
   <div class="container sidebar-sticky">
     <div class="sidebar-about">
       <a href="{{ .Site.BaseURL }}"><h1>{{ .Site.Title }}</h1></a>
+      <p class="lead">
+      {{ with .Site.Params.description }} {{.}} {{ else }}An elegant open source and mobile first theme for <a href="http://hugo.spf13.com">hugo</a> made by <a href="http://twitter.com/mdo">@mdo</a>. Originally made for Jekyll.{{end}}
+      </p>
     </div>
 
     <nav>