feat: add moderation commands and update README

- Introduced a new set of moderation commands including `/moderation purge`, `/moderation timeout`, `/moderation kick`, `/moderation ban`, `/moderation unban`, `/moderation untimeout`, and `/moderation slowmode`.
- Updated README to include details about the new moderation features and commands.
- Enhanced help command to display moderation tools and their usage.

internal/commands/help/help.go

@@ -94,6 +94,17 @@ func HelpHandler(s *discordgo.Session, i *discordgo.InteractionCreate) {
 					"`/meeting invite user:@someone` — Allow a user to join\n" +
 					"`/meeting uninvite user:@someone` — Remove a user's permission",
 			},
+			{
+				Name: "Moderation (focused tools)",
+				Value: "" +
+					"`/moderation purge amount:<1-100>` — Delete recent messages (**Manage Messages**)\n" +
+					"`/moderation timeout user:@someone duration:<10m|1h|...> [reason]` — Timeout member (**Moderate Members**)\n" +
+					"`/moderation kick user:@someone [reason]` — Kick member (**Kick Members**)\n" +
+					"`/moderation ban user:@someone [delete_days] [reason]` — Ban member (**Ban Members**)\n" +
+					"`/moderation unban user_id:<id> [reason]` — Unban by user ID (**Ban Members**)\n" +
+					"`/moderation untimeout user:@someone [reason]` — Remove timeout (**Moderate Members**)\n" +
+					"`/moderation slowmode channel:#channel seconds:<0-21600>` — Set slowmode (**Manage Channels**)",
+			},
 			{
 				Name: "Leveling",
 				Value: "" +