Remove unused Context parameter in process_message function

The function process_message in discord bot code no longer requires the Context parameter, improving readability and simplifying function calls. This removal accounts for changes in the bot's design where the context is no longer necessary for processing Discord messages.

src/discord/bot.rs

@@ -24,7 +24,7 @@ impl Handler {
         Ok(Self { gpt_client })
     }
 
-    async fn process_message(&self, ctx: Context, msg: Message) -> Option<String> {
+    async fn process_message(&self, msg: Message) -> Option<String> {
         if msg.author.bot || !msg.content.starts_with(".") {
             return None;
         }
@@ -57,7 +57,7 @@ impl Handler {
 #[async_trait]
 impl EventHandler for Handler {
     async fn message(&self, ctx: Context, msg: Message) {
-        if let Some(result) = self.process_message(ctx.clone(), msg.clone()).await {
+        if let Some(result) = self.process_message(msg.clone()).await {
             let processing_future = msg.channel_id.say(&ctx.http, "Processing...");
 
             match processing_future.await {