docs: Update README.md

Author: thorlauridsen

README.md

@@ -50,7 +50,7 @@ to create a temporary PostgreSQL database for tests. This requires
 a local Docker instance to be running when executing the tests.
 
 ## Gradle best practices
-[kotlinlang.org](https://kotlinlang.org/docs/gradle-best-practices.html)
+[docs.gradle.org](https://docs.gradle.org/current/userguide/performance.html) - [kotlinlang.org](https://kotlinlang.org/docs/gradle-best-practices.html)
 
 ### Preface
 This project uses Java but the linked article above is generally meant