Fixed doc search

Signed-off-by: Vishal Rana <vr@labstack.com>

Author: vishr

website/layouts/partials/head.html

@@ -21,7 +21,7 @@
     {{ if ne .URL "/" }}{{ .Title }} | {{ end }}{{ .Site.Title }}
   </title>
   <link rel="stylesheet" href="https://unpkg.com/font-awesome@4.6.3/css/font-awesome.min.css">
-  <!--<link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/2/docsearch.min.css">-->
+  <link rel="stylesheet" href="https://unpkg.com/docsearch.js@2.2.1/dist/cdn/docsearch.min.css">
   <link rel="stylesheet" href="https://cdn.labstack.com/styles/w3.css">
   <link rel="stylesheet" href="https://cdn.labstack.com/styles/prism.css">
   <link rel="stylesheet" href="https://cdn.labstack.com/styles/base.css">