$theme-default: support options.activeHeaderLinks (close: #1488) (#1508)

Author: shigma

packages/@vuepress/theme-default/index.js

@@ -18,7 +18,7 @@ module.exports = (options, ctx) => ({
   },
 
   plugins: [
-    '@vuepress/active-header-links',
+    ['@vuepress/active-header-links', options.activeHeaderLinks],
     '@vuepress/search',
     '@vuepress/plugin-nprogress',
     ['container', {