docs: adopt MIT license, remove unused LICENSE.gnu and update README

LICENSE.gnu

@@ -1,26 +0,0 @@
-GNU AFFERO GENERAL PUBLIC LICENSE
-Version 3, 19 November 2007
-
----
-
-Copyright © Patrick Asmus (scriptos)
-
-Name:    Patrick Asmus (scriptos)
-Email:   support@techniverse.net
-Website: https://www.patrick-asmus.de
-Blog:    https://www.cleveradmin.de
-
----
-
-This program is free software: you can redistribute it and/or modify
-it under the terms of the GNU Affero General Public License as published by
-the Free Software Foundation, either version 3 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU Affero General Public License for more details.
-
-You should have received a copy of the GNU Affero General Public License
-along with this program. If not, see <https://www.gnu.org/licenses/>.

README.md

@@ -138,6 +138,6 @@ Zend Engine v4.4.26, Copyright (c) Zend Technologies
 
 <p align="center">
   <sub>
-     © Patrick Asmus · Techniverse Network · <a href="./LICENSE.gnu">GPL-3.0 Lizenz</a>
+     © Patrick Asmus · Techniverse Network · <a href="./LICENSE">MIT Lizenz</a>
   </sub>
 </p>