Rename app folder to "web"
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web/config/config.env.inc.php

Remove
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$path = dirname(dirname(dirname(__FILE__))) . '/dev/conn/init.inc.php';
if ( file_exists($path) ) {
	include_once( $path );
}
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web/config/config.env.inc.php

Edit
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error_reporting( 0 );     //-- for production use
//error_reporting( E_ALL ); //-- for development
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web/config/config.db.inc.php

Edit
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$cfg[ 'db-hostname' ] = "localhost";
$cfg[ 'db-username' ] = "myusername";
$cfg[ 'db-password' ] = "mypassword";
$cfg[ 'db-database' ] = "mydatabase";

$cfg[ 'db-tbl-prefix' ] = 'tbl_';