Remove social link items and update test email

resources/views/mail/system/social_link.blade.php

@@ -1,21 +0,0 @@
-@component('mail::message',['site'=>$site,'heading'=>'Link Your Account'])
-Hi {{ isset($user) ? $user->name_full.',' : '' }}
-
-A request was made to link your account to a social login.
-If you didnt make this request, you can ignore this, and the request will be ignored.
-If you did make the request, then please enter the code displayed below.
-
-@component('mail::button')
-{{ $token }}
-@endcomponent
-
-Once you've keyed in this code, you'll be able to login to your account using your social login instead of a username and a password.
-
-Thanks,
-
-{{ config('mail.from.name') }}
-
-@component('mail::subcontent')
-If you didnt make this request, you can safely ignore this email - no change was made to your account, nor was it accessed by an unauthorised person.
-@endcomponent
-@endcomponent