Update head.html

Fixes #49

layouts/partials/head.html

@@ -15,10 +15,10 @@
   {{- end }}
 
   <!-- CSS -->
-  <link rel="stylesheet" href="{{ .Site.BaseURL }}css/print.css" media="print">
-  <link rel="stylesheet" href="{{ .Site.BaseURL }}css/poole.css">
-  <link rel="stylesheet" href="{{ .Site.BaseURL }}css/syntax.css">
-  <link rel="stylesheet" href="{{ .Site.BaseURL }}css/hyde.css">
+  <link type="text/css" rel="stylesheet" href="{{ .Site.BaseURL }}css/print.css" media="print">
+  <link type="text/css" rel="stylesheet" href="{{ .Site.BaseURL }}css/poole.css">
+  <link type="text/css" rel="stylesheet" href="{{ .Site.BaseURL }}css/syntax.css">
+  <link type="text/css" rel="stylesheet" href="{{ .Site.BaseURL }}css/hyde.css">
   {{ partial "head_fonts.html" . }}
 
   <!-- Icons -->