Added support for git-doc

support/reference/layout.md

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+### Navigation
+On the documentation/guide/reference pages, the sections created in your reference and guide
+directories will be listed on the right as the main navigation links, you can have subsections too.
+Any h3(###) lines you include in your reference/guide files will be added to the subsections under
+the main section link. They will be hidden until you hover over the main section link or have
+clicked the section link.
+
+### Headers
+You can use any size headers you want, but it is adivised to use h3(###) and smaller, anything
+bigger than h3(e.g. h2) is usually too big for the default layout.
+
+### Scrolling
+When you scroll down the page the navigation will follow you if the screen is big enough for the
+navigation to fit on the right side, otherwise it sits at the top.