Documentation improvements ### Documentation - Fixed the links to the documentation in the README (#150, !87) - Added a tutorial to discover Compose and Decouple (#150, !87) - List all components in the documentation (#151, !88) - Module headers for all modules with stability declarations (#165, !93) ### Demo - Added a calculator example (!84) by @chrhuang ### Build and deployment - Reworked the module names for simpler navigation (#164, !91) - Publish all modules to the GitLab Maven Registry (#163, !92) - Gradle 8.1.1 (#130, !94)