Remove reference to no-longer used sbt-dotty plugin

Author: Philippus

src/main/g8/README.md

@@ -4,6 +4,3 @@
 
 This is a normal sbt project, you can compile code with `sbt compile` and run it
 with `sbt run`, `sbt console` will start a Scala 3 REPL.
-
-For more information on the sbt-dotty plugin, see the
-[dotty-example-project](https://github.com/lampepfl/dotty-example-project/blob/master/README.md).