Update Announcements (#422)

Co-authored-by: Hack Bot <uclaacmhack+ghbot@gmail.com>

src/data/announcements.json

@@ -1,4 +1,10 @@
 [
+    {
+        "id": 2,
+        "subject": "Opening ceremony starts soon!",
+        "body": "Hello hackers! The beginning of Hack on the Hill is coming! \r\n\r\nWe\u2019re kicking things off at our OPENING CEREMONY in a few minutes in the Carnesale Commons Palisades Room! Excited to see everyone there and welcome you all to our 12-hour hackathon experience!",
+        "timestamp": "2024-03-03T16:26:54Z"
+    },
     {
         "id": 1,
         "subject": "Time to check in!",