Looks like you've mixed files/folders - some moodle code ... many are not.
In cPanel, do a search for something unique to moodle code ... config-dist.php file comes to mind. If found, you might find more than one (I see a moodle3.1 directory in screen shot), note the directory that it is in. Look in that directory for a version.php file. View that file and it will show version of Moodle code.
In other words, you have a mess ... since the site appears to be pointed to public_html (document root for hosting), no browser can find an index.php file - thus you get 403 forbidden because your apache server will not show raw directory listings.
'SoS', Ken