Default theme implementation to display a node.
Available variables:
node: The node entity with limited access to object properties and methods. Only method names starting with "get", "has", or "is" and a few common methods such as "id", "label", and "bundle" are available. For example: node.getCreatedTime() will return the node creation timestamp. node.hasField('field_example') returns TRUE if the node bundle includes field_example. (This does not indicate the presence of a value in this fiel