Adds SDKMan so we can install Kotlin

removes JAVA_HOME as its now managed by SDKMAN

install.conf.yaml

@@ -40,3 +40,4 @@
       ]
     - [git submodule update --init --recursive, Installing submodules]
     - [fc-cache -fv, Updating Font Cache]
+    - [~/.dotfiles/scripts/setupKotlin.sh, Setting up Kotlin]