By default the pages are ordered by their filenames. If you want to manually order pages, you can use "order" metadata:
Ordering allows you to make sure that for example the "Getting started" documentation can be found from the top.
Each page is part of a group. Group details are defined in the configuration.xml:
<Groups> <Group Key="">Home</Group> <Group Key="architecture">My Architecture</Group> <Group Key="about">About</Group> </Groups>
In the above example, the Home group is the first, architecture is the second and so on.