refactor: simplify code, better organize it, and comment it

src/discord/mod.rs

@@ -1,6 +1,7 @@
 mod commands;
 mod events;
 pub mod utils;
+pub mod error;
 
 use poise::FrameworkBuilder;
 use utils::serenity;
@@ -12,6 +13,11 @@ use self::events::event_handler;
 
 pub type Result = ::std::result::Result<(), Error>;
 
+/// Bootstraps the Discord bot.
+///
+/// # Panics
+///
+/// Panics if the environment `DISCORD_TOKEN` is unavailable.
 pub fn make_bot() -> FrameworkBuilder<BotData, Error> {
     poise::Framework::builder()
         .options(poise::FrameworkOptions {