[Epic] Dependency management

[binkley]

There are several cards that touch on dependency management including:

• Move example files into their own directory #515 - Tie together jdeps and dependencycheck and dependabot
• Reorg sidebar #520 - Reorg sidebar
• [Spike] Try out Spotless; outcome: Do include Spotless in the project #489 - Try out Spotless

Discussion should include how Gradle and Maven builds can pull in dependencies/plugins not available in their default public sites (such as internal corporate libraries, or odd public dependencies/plugins).
In Maven-world, this may involve a <repositories> section in pom.xml if something is not in Maven Central.