Update registration date

Author: mathdugre

data.json

@@ -12,7 +12,7 @@
   },
   "code_of_conduct_link": "https://brainhack.org/code-of-conduct.html",
   "registration_link": "",
-  "registration_text": "Registration opening on November 3rd!",
+  "registration_text": "Registration opening soon!",
   "survey_link": "",
   "discord_link": "https://discord.gg/wysCYqTWyM",
   "project_link": "https://brainhack.org/global2025/projects/",