Reorganized the project structure by separating the plugin implementation into its own module and renaming directories/files for clarity. Enhanced Docker plugin functionality with configurable JVM application support. Updated build scripts and CI workflows to reflect the changes.

Refactored and clarified the example for configuring JVM application images. Moved `configureJvmApplication` to a standalone block and added an example with `additionalConfig`. Improved readability and maintained all defaults for easier understanding.

Adjusted the Gradle task path to explicitly target the plugin module during the publish step. This ensures the correct module is published, addressing potential ambiguities in multi-module setups.