Add guild name to greeting format

bot/src/main.ts

@@ -142,7 +142,8 @@ client.bot.on("guildMemberAdd", async member => {
     
     await greetingChannel.send(formatString(guildGreeting.onJoinMessage, {
         memberID: member.id,
-        memberTag: member.user?.tag ?? member.displayName
+        memberTag: member.user?.tag ?? member.displayName,
+        guildName: member.guild.name
     }));
 });
 
@@ -154,7 +155,8 @@ client.bot.on("guildMemberRemove", async member => {
     
     await greetingChannel.send(formatString(guildGreeting.onLeaveMessage, {
         memberID: member.id,
-        memberTag: member.user?.tag ?? member.displayName
+        memberTag: member.user?.tag ?? member.displayName,
+        guildName: member.guild.name
     }));
 });