Async fonts

Signed-off-by: René Jochum <rene@jochum.dev>

themes/persona/layouts/partials/header.includes.html

@@ -1,12 +1,12 @@
     <link type="text/css" href="{{ .Site.BaseURL }}/static/css/bootstrap.min.css" rel="stylesheet"/>
     <link type="text/css" href="{{ .Site.BaseURL }}/static/css/bootstrap-theme.min.css" rel="stylesheet"/>
 
-    <link type="text/css" href="{{ .Site.BaseURL }}/static/css/persona-icons.css" rel="stylesheet"/>
+    <link type="text/css" media="print" onload="this.onload=null;this.removeAttribute('media');" href="{{ .Site.BaseURL }}/static/css/persona-icons.css" rel="stylesheet"/>
 
     <!-- Fonts ni style.css -->
-    <link type="text/css" href="{{ .Site.BaseURL }}/static/css/font-awesome.min.css" rel="stylesheet" /> 
-    <link type="text/css" href="{{ .Site.BaseURL }}/static/css/lato-font.css" rel="stylesheet"/>
-    <link type="text/css" href="{{ .Site.BaseURL }}/static/css/notoserif-font.css" rel="stylesheet"/>
+    <link type="text/css" media="print" onload="this.onload=null;this.removeAttribute('media');" href="{{ .Site.BaseURL }}/static/css/font-awesome.min.css" rel="stylesheet" /> 
+    <link type="text/css" media="print" onload="this.onload=null;this.removeAttribute('media');" href="{{ .Site.BaseURL }}/static/css/lato-font.css" rel="stylesheet"/>
+    <link type="text/css" media="print" onload="this.onload=null;this.removeAttribute('media');" href="{{ .Site.BaseURL }}/static/css/notoserif-font.css" rel="stylesheet"/>
 
     <link type="text/css" href="{{ .Site.BaseURL }}/static/css/style.css" rel="stylesheet"/>
     <link type="text/css" href="{{ .Site.BaseURL }}/static/css/responsive.css" rel="stylesheet"/>