Doc: header is hidden on a page when the URL contains hash

[jakub-g]

When a URL with a hash is used in a link, like this one:
http://atpackager.ariatemplates.com/configuration.html#aria-templates-specific
then upon navigating to this URL, the <h2> is hidden because we have an always-on-top <header>. Solution could be to listen to hashchange event and scroll by an appropriate amount.

Same happens in noder doc:
http://noder-js.ariatemplates.com/getstarted.html#loading-your-first-module