remove nixnet

directory.json

@@ -11,7 +11,6 @@
 "Infini" : "https://www.infini.fr/librehost.json",
 "LibreOps" : "https://libreops.cc/librehost.json",
 "LinuxPizza" : "https://linux.pizza/librehost.json",
-"NixNet" : "https://nixnet.services/librehost.json",
 "Nomagic" : "https://nomagic.uk/librehost.json",
 "Petites Singularités" : "https://ps.lesoiseaux.io/librehost.json",
 "snopyta.org" : "https://snopyta.org/librehost.json",