Update en.json

docs/en/en.json

@@ -1603,6 +1603,10 @@
                         "path": "/manuals/html5",
                         "name": "Introduction"
                     },
+                    {
+                        "path": "/extension-crazygames",
+                        "name": "CrazyGames"
+                    },
                     {
                         "path": "/extension-facebook",
                         "name": "Facebook"