It's very simple:
- keep the original .htaccess from the public folder
- copy .htacccess and index.php from public folder to the root of your project;
- edit the index.php and change the line below...
$pathsPath = FCPATH . '../app/Config/Paths.php';
to...
$pathsPath = FCPATH . 'app/Config/Paths.php';
That's it!