Serve the state diagram from the docs site and drop the contributors image - #511

Gradle 8.7 is out of date: consider updating to the latest Gradle version. See https://docs.gradle.org/current/userguide/feature_lifecycle.html#eol_support

Submitted dependency-graph-reports/dynamicdependency-graphauto-submission-submit-gradle.json: The snapshot was accepted, but it is not for the default branch. It will not update dependency results for the repository.

Using Java 21 (temurin) with Gradle (using wrapper)