Use Notification/Notifiable (#379)

* Add migrations for notifiables

* Configure spatie-backup to run as part of cron

* Convert Mailer to Notification; add pirep notifications

* Styling

app/Notifications/UserRegistered.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\User;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Notification;
+
+class UserRegistered extends Notification implements ShouldQueue
+{
+    use Queueable;
+
+    private $user;
+
+    /**
+     * Create a new notification instance.
+     *
+     * @param \App\Models\User $user
+     */
+    public function __construct(User $user)
+    {
+        $this->user = $user;
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @param mixed $notifiable
+     *
+     * @return array
+     */
+    public function via($notifiable)
+    {
+        return ['mail'];
+    }
+
+    /**
+     * Get the mail representation of the notification.
+     *
+     * @param mixed $notifiable
+     *
+     * @return \Illuminate\Notifications\Messages\MailMessage
+     */
+    public function toMail($notifiable)
+    {
+        return (new MailMessage())
+            ->from(config('mail.from.address', 'no-reply@phpvms.net'))
+            ->subject('Welcome to '.config('app.name').'!')
+            ->markdown('mail.user.registered', ['user' => $this->user]);
+    }
+
+    public function toArray($notifiable)
+    {
+        return [
+            'user_id' => $this->user->id,
+        ];
+    }
+}