Update README.md

Remove the link to the German translation as it is no longer available.

Author: mazedlx

README.md

@@ -36,7 +36,6 @@ You should read the `CONTRIBUTING.md` file for precise instructions and tips. Bu
 <https://www.phptherightway.com>
 
 * [English](https://www.phptherightway.com)
-* [Deutsch](https://rwetzlmayr.github.io/php-the-right-way)
 * [Español](https://phpdevenezuela.github.io/php-the-right-way)
 * [Français](https://eilgin.github.io/php-the-right-way/)
 * [Indonesia](https://id.phptherightway.com)