Remove onjoin message.

cogs/guild_listener/__init__.py

@@ -27,13 +27,6 @@ class GuildListener(commands.Cog, name="Guild Listener"):
             session.add(new_guild)
             session.commit()
 
-        welcome_message: str = "Hello, I keep track of Highscores for you!"
-        welcome_message += " Currently only supporting RuneScape boss highscores,"
-        welcome_message += " but will be more dynamic support in future."
-        welcome_message += ' For assistance on getting started, use "?register help".'
-
-        await guild.system_channel.send(content=welcome_message)
-
 
 # This function will be called when this extension is loaded.
 # It is necessary to add these functions to the bot.