fixed mixed content

Author: mattn

_layouts/2014/default.html

@@ -11,11 +11,11 @@
 <meta property="og:site_name" content="VimConf - Vim Conference">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>{{page.title | liquify}} - VimConf 2014</title>
-<base href="{{site.github.url}}{{site.data.y2014.root}}/" target="_self">
+<base href="{{site.github.url | replace: 'http://', '//'}}{{site.data.y2014.root}}/" target="_self">
 <link rel="stylesheet" href="default.css">{%for css in page.stylesheets%}
 <link rel="stylesheet" href="{{css}}">{%endfor%}
 </head>
-<body{%if page.class.body%} class="{{page.class.body}}"{%endif%}>
+<body{%if page.class.body%} class="{{page.class.body | replace: 'http://', '//'}}"{%endif%}>
 {{content}}</body>
 <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>{%for js in page.javascripts%}
 <script src="{{js}}"></script>{%endfor%}

_layouts/2015/default.html

@@ -9,7 +9,7 @@
     <meta property="og:description" content="{{page.summary|liquify|markdownify|strip_html}}">{%endif%}
     <meta property="og:site_name" content="VimConf 2015 - Vim Conference">
     <title>{{page.title | liquify}}</title>
-    <base href="{{site.github.url}}/2015/" target="_self">
+    <base href="{{site.github.url | replace: 'http://', '//'}}/2015/" target="_self">
     <link rel="stylesheet" href="default.css">{%for css in page.stylesheets%}
     <link rel="stylesheet" href="{{css}}">{%endfor%}
     <link rel='stylesheet' href='//fonts.googleapis.com/css?family=Ubuntu:300,400'>

_layouts/2016/default.html

@@ -9,7 +9,7 @@
     <meta property="og:description" content="{{page.summary|liquify|markdownify|strip_html}}">{%endif%}
     <meta property="og:site_name" content="VimConf 2016 - Vim Conference">
     <title>{{page.title | liquify}}</title>
-    <base href="{{site.github.url}}/2016/" target="_self">
+    <base href="{{site.github.url | replace: 'http://', '//'}}/2016/" target="_self">
     <link rel="stylesheet" href="default.css">
     <link href="//fonts.googleapis.com/css?family=Bungee+Hairline|Bungee+Outline|Bungee+Inline" rel="stylesheet">
   </head>

_layouts/2017/default.html

@@ -11,7 +11,7 @@
     <meta property="og:description" content="{{page.summary|liquify|markdownify|strip_html}}">{%endif%}
     <meta property="og:site_name" content="VimConf 2017 - Vim Conference">
     <title>{{page.title | liquify}}</title>
-    <base href="{{site.github.url}}/2017/" target="_self">
+    <base href="{{site.github.url | replace: 'http://', '//'}}/2017/" target="_self">
     <link rel="stylesheet" href="//fonts.googleapis.com/css?family=Roboto:300,400,500,700" type="text/css">
     <link rel="stylesheet" href="//fonts.googleapis.com/icon?family=Material+Icons">
     <link rel="stylesheet" href="//code.getmdl.io/1.3.0/material.teal-red.min.css" />