Social media icons are not able to display when deployed using Github pages

[Lanzhou-J]

Issue description: After changing SNS settings in _config.yml file, RSS, Twitter, Zhihu, Weibo, Facebook, and Github icons (on both footer and sidebar) do not display when deployed using Github pages.
Example:
Footer error icons:

Sidebar error icons:

However, icons are displayed nicely when using bundle exec jekyll serve locally
Example:
Footer correct icons:

Sidebar correct icons:

[Lanzhou-J]

相关问题：链接可以显示但图标无法正常显示
原因：font-awesome链接不可用
解决方法：
将相关文件里（head.html）的：
<link href="http://cdn.staticfile.org/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet" type="text/css">
全部更换为：
<link href="https://cdn.staticfile.org/font-awesome/4.2.0/css/font-awesome.min.css" rel="stylesheet" type="text/css">