Massivly simplify notes index controller method

app/MicropubClient.php

@@ -19,4 +19,13 @@ class MicropubClient extends Model
      * @var array
      */
     protected $fillable = ['client_url', 'client_name'];
+
+    /**
+     * Define the relationship with notes.
+     *
+     * @return void
+     */
+    public function notes() {
+        return $this->hasMany('App\Note', 'client_id', 'client_url');
+    }
 }