Replace captcha system

config/captcha.php

@@ -1,50 +0,0 @@
-<?php
-
-return [
-    'characters' => ['2', '3', '4', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'M', 'N', 'P', 'Q', 'R', 'T', 'U', 'X', 'Y', 'Z'],
-    'default' => [
-        'length' => 5,
-        'width' => 120,
-        'height' => 36,
-        'quality' => 90,
-        'math' => false,
-        'expire' => 60,
-        'encrypt' => false,
-    ],
-    'math' => [
-        'length' => 9,
-        'width' => 120,
-        'height' => 36,
-        'quality' => 90,
-        'math' => true,
-    ],
-
-    'flat' => [
-        'length' => 6,
-        'width' => 160,
-        'height' => 46,
-        'quality' => 90,
-        'lines' => 6,
-        'bgImage' => false,
-        'bgColor' => '#ecf2f4',
-        'fontColors' => ['#2c3e50', '#c0392b', '#16a085', '#c0392b', '#8e44ad', '#303f9f', '#f57c00', '#795548'],
-        'contrast' => -5,
-    ],
-    'mini' => [
-        'length' => 3,
-        'width' => 60,
-        'height' => 32,
-    ],
-    'inverse' => [
-        'length' => 5,
-        'width' => 120,
-        'height' => 36,
-        'quality' => 90,
-        'sensitive' => true,
-        'angle' => 12,
-        'sharpen' => 10,
-        'blur' => 2,
-        'invert' => true,
-        'contrast' => -5,
-    ]
-];