private static Path getHome() {
		return Paths.get(System.getProperty("user.home"));
	}
Makes a best guess if JAVA_HOME should be set by us or not. Returns true if
no JAVA_HOME is set and javac wasn't found on the PATH and we have at least
one managed JDK installed by us. Otherwise it returns false.
src/main/java/dev/jbang/cli/App.java