Remove www from c3d2 (#317)

This should fix the CORS error at https://mapall.space/onespace.php?space=C3D2 as we redirect www.c3d2.de to c3d2.de

Author: SuperSandro2000

directory.json

@@ -20,7 +20,7 @@
   "Brixel": "https://status.brixel.space/api/status",
   "Bytespeicher": "https://status.bytespeicher.org/status.json",
   "C-Hack Calw": "https://spaceapi.c-hack.de",
-  "C3D2": "https://www.c3d2.de/spaceapi.json",
+  "C3D2": "https://c3d2.de/spaceapi.json",
   "CCC Aachen": "https://status.aachen.ccc.de/spaceapi",
   "CCC Basel": "https://spaceapi.kabelsalat.ch/",
   "CCC Cologne": "https://api.koeln.ccc.de",