* Add new attribute instagram_placeholder to local yml
* Add placeholder to instagram link input
* Add migration to fix wrong instagram links
* Add new attribute facebook_placeholder to local yml
* Add placeholder to facebook link input
* Add new attribute linkedin_placeholder to local yml
* Add placeholder to linkedin link input
* Change each for find_each in migration
* Add new attribute instagram_placeholder to local yml
* Add migration to fix wrong instagram links
* Add new attribute linkedin_placeholder to local yml
* Add placeholder to linkedin link input