Fixed some warnings when using on Safari

layouts/partials/css.html

@@ -22,7 +22,7 @@
 <link rel="stylesheet" href="https://fonts.googleapis.com/css?family={{ .Site.Params.font }}">
 
 <!-- highlight.js -->
-{{ if .Site.Params.highlight | default false }} <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/{{ .Site.Params.highlightStyle | default "default" }}.min.css"> {{ end }}
+{{ if .Site.Params.highlight | default false }} <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/styles/{{ .Site.Params.highlightStyle | default "default" }}.min.css"> {{ end }}
 
 <!-- bootstrap -->
 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

layouts/partials/js.html

@@ -1,9 +1,9 @@
 <!-- highlight.js -->
 {{ if .Site.Params.highlight | default false }}
 
-    <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/highlight.min.js"></script>
 
-    {{ range .Site.Params.highlightLanguages }} <script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/languages/{{ . }}.min.js"></script> {{ end }}
+    {{ range .Site.Params.highlightLanguages }} <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.12.0/languages/{{ . }}.min.js"></script> {{ end }}
 
     <script>hljs.initHighlightingOnLoad();</script>