feat: remove legacy bot code

src/core/discord/client.ts

@@ -1,5 +1,4 @@
 import { Client, GatewayIntentBits } from 'discord.js';
-import guildMemberAdd from '../../events/guildMemberAdd';
 import interactionCreate from '../../events/interactionCreate';
 import ready from '../../events/ready';
 
@@ -7,5 +6,4 @@ export const client = new Client({
   intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildMembers],
 })
   .on('ready', ready)
-  .on('guildMemberAdd', guildMemberAdd)
   .on('interactionCreate', interactionCreate);