Updated author informations, updated location of included files, structured the website to the new layout, removed local fontawesome and moved to cloud CDN

lib/php/user_login.php

@@ -0,0 +1,12 @@
+<?php
+    $user = [
+        'username' => $_POST [ 'username' ],
+        'password' => $_POST [ 'password' ],
+    ];
+    if ( false ) {
+        //TODO: ask the database if the user exists and check if the password is correct then
+    }
+    else {
+        header ( "Location /" ); //TODO: modify with json response with "Wrong username or password" message
+        exit;
+    }