feat: switch to new config API

Author: mychidarko

src/Exception/General.php

@@ -66,7 +66,7 @@ public static function handleErrors($errno, $errstr = '', $errfile = '', $errlin
         try {
             throw new \ErrorException($errstr, $errno, 0, $errfile, $errline);
         } catch (\Throwable $th) {
-            $app = \Leaf\Config::get('app')['instance'];
+            $app = \Leaf\Config::get('app');
 
             if ($app && $app->config('log.enabled')) {
                 $app->logger()->error($th);
@@ -229,9 +229,9 @@ public static function csrf($error = null)
     public static function defaultError($e = null)
     {
         if ($e) {
-            $app = \Leaf\Config::get("app")["instance"];
+            $app = \Leaf\Config::get('app');
 
-            if ($app && $app->config("log.enabled")) {
+            if ($app && $app->config('log.enabled')) {
                 $app->logger()->error($e);
             }
         }

src/Exception/Run.php

@@ -457,9 +457,9 @@ public function handleError($level, $message, $file = null, $line = null)
             // XXX we pass $level for the "code" param only for BC reasons.
             // see https://github.com/filp/whoops/issues/267
             $exception = new ErrorException($message, /*code*/ $level, /*severity*/ $level, $file, $line);
-            $app = \Leaf\Config::get("app")["instance"];
+            $app = \Leaf\Config::get('app');
 
-            if ($app && $app->config("log.enabled")) {
+            if ($app && $app->config('log.enabled')) {
                 $app->logger()->error($exception);
             }