Remove sourceCodeButton config key (#181)

examples/basics/siteConfig.js

@@ -18,7 +18,7 @@ const users = [
 const siteConfig = {
   title: "Test Site" /* title for your website */,
   tagline: "A website for testing",
-  url: "https://deltice.github.io" /* your github url */,
+  url: "https://deltice.github.io" /* your website url */,
   baseUrl: "/test-site/" /* base url for your project */,
   projectName: "test-site",
   headerLinks: [
@@ -45,7 +45,12 @@ const siteConfig = {
   highlight: {
     // Highlight.js theme to use for syntax highlighting in code blocks
     theme: "default"
-  }
+  },
+  scripts: [
+    "https://buttons.github.io/buttons.js"
+  ],
+  // You may provide arbitrary config keys to be used as needed by your template.
+  repoUrl: "https://github.com/deltice/test-site",
 };
 
 module.exports = siteConfig;