Refactor importing statements in discord bot module

This commit simplifies the importing statement in the discord bot module. Instead of using a direct hierarchy, the bot class is now exported directly from the 'discord' module. This change reduces the complexity of the import paths and increases readability without affecting functionality.

src/bin/bootstrap.rs

@@ -5,7 +5,7 @@ use tokio;
 
 use dotenv;
 
-use gpt_discord_bot::discord::bot::Handler;
+use gpt_discord_bot::bot::Handler;
 
 #[tokio::main]
 async fn main() {

src/lib.rs

@@ -1 +1,2 @@
-pub mod discord;
+mod discord;
+pub use crate::discord::bot;