fix link to mill

Author: martijnhoekstra

_overviews/scala-book/scala-build-tool-sbt.md

@@ -162,7 +162,7 @@ Here’s a list of other build tools you can use to build Scala projects are:
 - [Gradle](https://gradle.org/)
 - [Maven](https://maven.apache.org/)
 - [Fury](https://propensive.com/opensource/fury)
-- [Mill](http://www.lihaoyi.com/mill)
+- [Mill](https://com-lihaoyi.github.io/mill/)
 
 
 

scala3/getting-started.md

@@ -35,7 +35,7 @@ Install it on your system with the following instructions.
 Along with managing JVMs, `cs setup` also installs useful command line tools:
 
 - A JDK
-- The [sbt](https://www.scala-sbt.org) and [mill](https://www.lihaoyi.com/mill) build tools
+- The [sbt](https://www.scala-sbt.org) and [mill](https://com-lihaoyi.github.io/mill/) build tools
 - [Ammonite](https://ammonite.io), an enhanced REPL
 - [scalafmt](https://scalameta.org/scalafmt), the Scala formatter
 - The [Coursier CLI](https://get-coursier.io/docs/cli-overview), to install further Scala-based applications