Review property ordering in basic configuration example

We'd like to review whether the properties included in the basic configuration example are in the appropriate logical order.

There's one property that has a section heading, but it's the only property under that heading (`sleeper.logging.level`).

We can consider reordering them in the property definitions file, reorganising property groups, or making a specific ordering or grouping for the basic example in GeneratePropertiesTemplates.

Start by locating the property definitions file and the GeneratePropertiesTemplates entry point, then inspect how the basic configuration example derives its property order and headings. Review the current grouping, especially the lone sleeper.logging.level section, and consider the stated ordering options; done means the example has a logical, consistent arrangement with no inappropriate single-property grouping.

Written by the indexing model from the issue text.