Remove https://invidious.nerdvpn.de at request of instance owner

#241

Author: bugmaschine

docs/instances.md

@@ -14,8 +14,6 @@
 
 * [inv.nadeko.net](https://inv.nadeko.net) 🇨🇱 - Source code/changes: https://git.nadeko.net/Fijxu/invidious - CAPTCHA: mCaptcha (https://mcaptcha.org/)
 
-* [invidious.nerdvpn.de](https://invidious.nerdvpn.de) 🇺🇦 - Source code/changes: https://github.com/Sommerwiesel/invidious-nerdvpn
-
 ### Tor Onion Services:
 
 * [inv.nadekonw7plitnjuawu6ytjsl7jlglk2t6pyq6eftptmiv3dvqndwvyd.onion](http://inv.nadekonw7plitnjuawu6ytjsl7jlglk2t6pyq6eftptmiv3dvqndwvyd.onion) 🇨🇱 (Onion of inv.nadeko.net)