fix: Fixed bug that installation failed.

Because the file composition has changed by the next PR of Code Igniter 4,
editing of a nonexistent file and deletion of the code that is about to be copied.

codeigniter4/CodeIgniter4#996

src/Installer.php

@@ -29,8 +29,6 @@ public static function postInstall(Event $event = null)
         self::recursiveCopy('vendor/codeigniter4/framework/writable', 'writable');
         self::recursiveCopy('vendor/codeigniter4/framework/tests', 'tests');
         copy('vendor/codeigniter4/framework/spark', 'spark');
-        copy('vendor/codeigniter4/framework/rewrite.php', 'rewrite.php');
-        copy('vendor/codeigniter4/framework/serve', 'serve');
         copy('vendor/codeigniter4/framework/phpunit.xml.dist', 'phpunit.xml.dist');
         copy('vendor/codeigniter4/framework/.gitignore', '.gitignore');
 
@@ -44,16 +42,6 @@ public static function postInstall(Event $event = null)
         );
         file_put_contents($file, $contents);
 
-        // Fix paths in serve
-        $file = 'serve';
-        $contents = file_get_contents($file);
-        $contents = str_replace(
-            'require_once __DIR__.\'/system/',
-            'require_once __DIR__.\'/vendor/codeigniter4/framework/system/',
-            $contents
-        );
-        file_put_contents($file, $contents);
-
         // Update composer.json
         copy('composer.json.dist', 'composer.json');