add desmos to direct links

json/directLinks.json

@@ -55,5 +55,6 @@
     "yandex": "https://yandex.com",
     "youtube": "https://www.youtube.com",
     "yt": "https://www.youtube.com",
-    "ztype": "https://zty.pe"
+    "ztype": "https://zty.pe",
+    "desmos": "https://www.desmos.com/calculator"
 }