Adding Source Code Pro bold for code headings

Author: pastelsky

template.ejs

@@ -6,7 +6,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <link rel="shortcut icon" href="/assets/favicon.ico">
 
-    <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro|Source+Sans+Pro:400,400i,500,500i" rel="stylesheet">
+    <link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:400,600|Source+Sans+Pro:400,400i,500,500i" rel="stylesheet">
 
     <link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/2/docsearch.min.css" />
     <% for (var file in webpackConfig.template.cssFiles) { %>