Update GitHub link to point to new ecs directory

Author: rudedogg

content/2022/lets-build-ecs-part-1.md

@@ -301,7 +301,7 @@ From this, you can easily gather that storing entities is actually only a small
 
 ## Next up: starting our ECS implementation
 
-As this series develops, all the code is being developed in the Mach repository's `ecs` subfolder [on GitHub](https://github.com/hexops/mach/tree/main/ecs). The articles will lag slightly behind.
+As this series develops, all the code is being developed in the Mach repository's `ecs` subfolder [on GitHub](https://github.com/hexops/mach/tree/main/libs/ecs). The articles will lag slightly behind.
 
 [As more articles come out, you can find them here](https://devlog.hexops.com/categories/build-an-ecs). Join us in developing it, give us advice, etc. [on Matrix chat](https://matrix.to/#/#ecs:matrix.org) or [follow updates on Twitter](https://twitter.com/machengine).