This box (everything between header and footer) is the content of views/index/index.php,
so it's the index/index view.
It's rendered by the index-method within the index-controller (in controllers/index.php).
General information on this little framework
"C'mon! Framework #1000 ? Why do we need this ?" Indeed, there are a lot of good
(and a lot of bad, too) PHP frameworks on the web. But most of them have something in common:
They don't have a proper login system. And even if they have, then it's using outdated
password hashing/salting technologies, it's not future-proof, don't provide email verification,
password reset etc.
This framework tries to focus on a proper, secure and up-to-date login system, combined with an easy-to-use, easy-to-understand and highly usable framework structure. So, if you don't like the framework itself, feel free to merge the login-related actions, models and views into the framework of your choice.