将 http 连接修改为 https 连接，页面带上小绿锁 (#4)

http:// -> //

public/index.html

@@ -12,7 +12,7 @@
 <div class="ui fixed borderless menu">
   <div class="ui text container" style="max-width: 100% !important;">
     <div href="#" class="header item">
-      <img class="logo" src="http://semantic-ui.com/examples/assets/images/logo.png" alt="logo">
+      <img class="logo" src="//semantic-ui.com/examples/assets/images/logo.png" alt="logo">
       Forsaken Mail
     </div>
     <div class="ui label item right floated mailaddress" style="width: 35%;">