fix env.example development -> dev

Author: charleslien

.env.example

@@ -35,7 +35,7 @@ DISCORD_BOT_TOKEN=dummy_discord_bot_token
 DISCORD_APPLICATION_ID=dummy_discord_app_id
 
 # Frontend/Public Variables
-NEXT_PUBLIC_CB_ENVIRONMENT=development
+NEXT_PUBLIC_CB_ENVIRONMENT=dev
 NEXT_PUBLIC_CODEBUFF_APP_URL=http://localhost:3000
 NEXT_PUBLIC_CODEBUFF_BACKEND_URL=http://localhost:4242
 NEXT_PUBLIC_SUPPORT_EMAIL=support@codebuff.com