DebugProbes, TestBalloon IntelliJ plugin and JDK 11+ for all runners

### Suite - On the JVM, coroutine DebugProbes are enabled automatically to log ongoing coroutines at the end of a test (#45, #87, !172) - Added the `@TestEntrypoint` annotation (72ea802d) ### TestBalloon runner - The default timeout is now 10s instead of 1m, like the other runners (e17b8ad2) - Now compatible with JDK 11+ (previously 17+, 614e9963) ### Documentation - Added more features to the highlight section of the home page (e4bb5f82) - Simplified the Atrium description (bbe1c05d) - Added an [explanation](https://prepared.opensavvy.dev/api-docs/runners/runner-testballoon/index.html) to configure the IntelliJ TestBalloon plugin (5c8b653b)