Removed custom add entity link.

Primarily used for identity_contact.module. Perhaps it will return in the future.

Author: dpi

src/Form/RegistrationForm.php

@@ -155,19 +155,6 @@ public function form(array $form, FormStateInterface $form_state) {
             '#tags' => FALSE,
             '#parents' => array('entity', $entity_type_id),
           ];
-
-          // Add link: The 'add' link is something invented by RNG, it is not a
-          // standard link.
-          // @todo: replace with add and reference ajax popup + form.
-          if ($add_link = $entity_type->getLinkTemplate('add-form')) {
-            $form['identity_information']['identity'][$entity_type_id]['add'] = [
-              '#type' => 'link',
-              '#title' => $this->t('Add @entity_type', ['@entity_type' => $entity_type->getLabel()]),
-              '#url' => Url::fromUserInput($entity_type->getLinkTemplate('add-form')),
-              '#prefix' => '[',
-              '#suffix' => ']',
-            ];
-          }
         }
       }