You deleted your index.php file.
Go to your file manager, and create a new file and name it “index.php” and add this code
<?php
/**
* Front to the WordPress application. This file doesn't do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/
/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define('WP_USE_THEMES', true);
/** Loads the WordPress Environment and Template */
require('./wp-blog-header.php');
?>
This is the default, so hopefully you didn’t change anything else! Let me know if this helped!
**EDIT**
This may much more…if you go to: https://yspinfo.org/ , not only do you not have an index but you don’t have any of the wordpress files….did you delete them all????