docs: add note about moved repository and migration to 1.0

Author: Meierschlumpf

README.md

@@ -1,3 +1,8 @@
+> [!IMPORTANT]  
+> The Homarr repository has been moved to [HomarrLabs](https://github.com/homarr-labs/homarr)
+> Please create issues related to 1.0 there. This repository will be archived once the 1.0 is fully polished.
+> 1.0 is a complete rewrite and to migrate you have to change your compose file. Please follow the [Migration Guide](https://homarr.dev/blog/2025/01/19/migration-guide-1.0) and read the [Breaking Changes](https://homarr.dev/blog/2024/09/23/version-1.0#breaking-changes)
+
 
 <!-- Project Title -->
 ![Banner](docs/banner.png)