Remove hook_install() from generated subprofiles

templates/profile/install.twig

@@ -6,9 +6,12 @@
  */
 
 /**
- * Implements hook_install().
+ * Implement hook_install() here to perform additional site information tasks,
+ * generate sample content, etc.
+ *
+ * Drupal 8.6 provides the ability to install sites directly from existing
+ * config when using the core configuration management system. Note that this
+ * feature cannot be used if your install profile implements hook_install().
+ *
+ * @see https://www.drupal.org/node/2897299
  */
-function {{ machine_name }}_install() {
-  // Add code here perform additional site information tasks, generate sample
-  // content, etc.
-}