Currently if you use the site module - then you must configure each of your page templates at /modules/site/config/site/templates/availability/templates in order for them to be available in the page editor. As we want to make using and especially getting started with Magnolia as easy as possible - we will remove the necessity to configure the page templates at this node.
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If the /modules/site/config/site/templates/availability node does not exist, all pages will be available.

As soon as the node is present - than only the pages configured here will be available - the familiar behaviour adopted from STK site availabillity.