Minor changes

Moved config into $GLOBALS
Moved request_uri into $GLOBALS
Modified all files accordingly
Modified logout page for future improvements (not deleting the entire $_SESSION)
Fixed LICENSEs, moved LICENSE for PHP files in /lib/php subfolder instead of /lib

lib/php/login.php

@@ -23,6 +23,7 @@
         $row = $result->fetch_assoc ( );
         if ( ! $row ) {
             header ( 'Content-Type: application/json' );
+            http_response_code ( 401 );
             $response = [
                 'status' => 401,
                 'error_message' => 'Username or password not correct.',
@@ -81,4 +82,3 @@
 </html>
 <?php
     }
-?>