Discuss Spring Boot as an example of modern configuration/versioning

[binkley]

Not sure what section of the book this goes in as an example. Perhaps redo/rename the Example projects page?

Spring Boot apps get out-of-the-box automatic version management for many known plugins/libraries during build. This project recreates some of that, and we add a lot of quality/security plugins as well. Spring Boot is very widely used in the JVM world, more so than any other equivalent project starter.

Perhaps provide a "Hello, world" minimal Spring Boot project as an example?