Revert "PLT-395: Add syntax highlighting to Markdown code blocks"

web/templates/head.html

@@ -24,7 +24,6 @@
     <link rel="stylesheet" href="/static/css/bootstrap-colorpicker.min.css">
     <link rel="stylesheet" href="/static/css/styles.css">
     <link rel="stylesheet" href="/static/css/google-fonts.css">
-    <link rel="stylesheet" class="code_theme" href="">
 
     <link id="favicon" rel="icon" href="/static/images/favicon.ico" type="image/x-icon">
     <link rel="shortcut icon" href="/static/images/favicon.ico" type="image/x-icon">