fix: tickets sell starts on February

Author: anyulled

src/data/2025.json

@@ -32,7 +32,7 @@
   },
   "startDay": "2025-07-08T09:00:00",
   "tickets": {
-    "startDay": "2025-01-01T00:00:00",
+    "startDay": "2025-02-01T00:00:00",
     "endDay": "2025-06-01T00:00:00"
   },
   "title": "DevBcn - Barcelona Developers Conference ",