Removed include gist.css, will loaded by gist-embed.js from gist ajax

Author: jackycute

public/views/head.ejs

@@ -25,7 +25,6 @@
 <link rel="stylesheet" href="/vendor/codemirror/theme/monokai.css">
 <link rel="stylesheet" href="/vendor/codemirror/theme/one-dark.css">
 <link rel="stylesheet" href="/css/github-extract.css">
-<link rel="stylesheet" href="/css/gist.css">
 <link rel="stylesheet" href="/vendor/highlight-js/github-gist.min.css">
 <link rel="stylesheet" href="/vendor/emojify/css/emojify.min.css">
 <link rel="stylesheet" href="/vendor/showup/showup.css">