added instant gaming site

Author: carnivuth

lib/sites.json

@@ -8,6 +8,7 @@
   { "site": "awsome-selfhosted","link": "https://www.github.com/awesome-selfhosted/awesome-selfhosted"},
   { "site": "cardmarket","link": "https://www.cardmarket.com"},
   { "site": "netflix","link": "https://www.netflix.com"},
+  { "site": "instant-gaming","link": "https://www.instant-gaming.com"},
   { "site": "blowfish-docs","link": "https://blowfish.page/"},
   { "site": "datacamp","link": "https://app.datacamp.com"},
   { "site": "discord","link": "https://discord.com/app"},