style(app.py): update logger warning messages for clarity and conciseness

Improve the clarity and conciseness of logger warning messages
regarding the use of eval commands by sysadmins. The updated messages
use emojis to quickly convey the nature of the warning and direct users
to the settings.yml.example file for more detailed information. This
change aims to make the warnings more user-friendly and informative.

Author: kzndotsh

tux/app.py

@@ -106,15 +106,15 @@ async def start(self) -> None:
             return
 
         owner_ids = {CONFIG.BOT_OWNER_ID}
+
         if CONFIG.ALLOW_SYSADMINS_EVAL:
             logger.warning(
-                "Sysadmins are allowed to use eval commands. This can be potentially dangerous if you have not fully read the comments about this in settings.yml.",
+                "⚠️ Eval is enabled for sysadmins, this is potentially dangerous; see settings.yml.example for more info.",
             )
             owner_ids.update(CONFIG.SYSADMIN_IDS)
+
         else:
-            logger.warning(
-                "Sysadmins are not allowed to use eval commands. Read settings.yml for more info on this. You can safely ignore this warning if you are not a sysadmin.",
-            )
+            logger.warning("🔒️ Eval is disabled for sysadmins; see settings.yml.example for more info.")
 
         self.bot = Tux(
             command_prefix=get_prefix,