I added a documentation page on how to build navigation for your site. This topic is primarily intended for users who have a lot of pages on their site (such as for documentation websites), and want to build a more robust sidebar navigation.
Jekyll combines Liquid with YAML in interesting ways that aren't really documented clearly in the existing docs, except for a brief reference [here](http://jekyllrb.com/docs/datafiles/#the-data-folder). You can read about Liquid on Shopify and YAML in YAML's docs, but exactly how you store YAML files in a Jekyll project and iterate through them using Liquid loops and filters to generate lists of pages is something that isn't clear to a lot of people. (You can see origins of these questions in [previous help issues](https://github.com/jekyll/jekyll-help/issues/266).) The documentation on navigation would fit well into the Jekyll docs.
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