Update README.md

Add note about official documentation site.

README.md

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 [![codecov](https://codecov.io/gh/gestalt-config/gestalt/branch/main/graph/badge.svg)](https://codecov.io/gh/gestalt-config/gestalt)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=gestalt-config_gestalt&metric=alert_status)](https://sonarcloud.io/summary/new_code?id=gestalt-config_gestalt)
 
+Visit the official documentation: https://gestalt-config.github.io/gestalt/
+All documentation is being migrated to the official documentation site. 
+
 Gestalt is a powerful Java configuration library designed to simplify the way you handle and manage configurations in your software projects. In the rapidly evolving landscape of software development, having a flexible and reliable configuration management system is essential for ensuring the smooth operation of your applications.
 
 Gestalt offers a comprehensive solution to the challenges of configuration management. It allows you to source configuration data from multiple inputs, merge them intelligently, and present them in a structured, type-safe manner. Whether you're working with Java beans, lists, sets, or primitive data types, Gestalt's automatic decoding based on data types simplifies the process.