refactor: remove Devnet announcement message

content/site.json

@@ -161,7 +161,7 @@
       ]
     }
   ],
-  "announcement": "The Pontus-X Devnet is currently undergoing a scheduled load test. The network remains stable and fully operational during this period.",
+  "announcement": "",
   "devPreviewAnnouncement": "You are visiting the SITE-TITLE-PLACEHOLDER Developer Preview. Please note that some functionalities are in beta and may not work as expected. Visit the [SITE-TITLE-PLACEHOLDER portal](SITE-LINK-PLACEHOLDER) instead.",
   "warning": {
     "ctd": "Please note that Compute-to-Data is still in alpha phase."