Add task to generate Kotlinlang reference

Based on the template from
https://github.com/JetBrains/kotlin-web-site/tree/master/dokka-templates.
Template itself is updated frequently and should be added by CI
configuration.

Generated reference has versioning support. Older generated references
should put into:
<project_dir>/<build_dir>/dokka/kotlinlangDocumentationOld

^KT-55520 Fixed

libraries/tools/kotlin-gradle-plugin-api/build.gradle.kts

@@ -5,7 +5,8 @@ plugins {
 }
 
 configureDokkaPublication(
-    shouldLinkGradleApi = true
+    shouldLinkGradleApi = true,
+    configurePublishingToKotlinlang = true,
 )
 
 dependencies {