Add secondary, page-specific navigation documentation (#498)

And enable for docusaurus.io

docs/api-site-config.md

@@ -126,6 +126,10 @@ h1 {
 
 `ogImage` - url for an Open Graph image. This image will show up when your site is shared on Facebook, Twitter and any other websites/apps where the Open Graph protocol is supported.
 
+`onPageNav` - If you want a visible navigation option for representing topics on the current page. Currently, there is one accepted value for this option:
+
+- `separate` - The secondary navigation is a separate pane defaulting on the right side of a document. See http://docusaurus.io/docs/en/translation.html for an example.
+
 `organizationName` - GitHub username of the organization or user hosting this project. This is used by the publishing script to determine where your GitHub pages website will be hosted.
 
 `scripts` - Array of JavaScript sources to load. The script tag will be inserted in the HTML head.

examples/basics/siteConfig.js

@@ -62,6 +62,8 @@ const siteConfig = {
   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/facebook/test-site',
+  /* On page navigation for the current documentation page */
+  // onPageNav: 'separate',
 };
 
 module.exports = siteConfig;

website/siteConfig.js

@@ -163,6 +163,7 @@ const siteConfig = {
   facebookAppId: '1615782811974223',
   twitter: 'true',
   ogImage: 'img/docusaurus.png',
+  onPageNav: 'separate',
 };
 
 module.exports = siteConfig;