/// Create a new bot using the Telegram bot token and chat ID from the environment variables.
///
/// # Example
///
/// ```
/// use rustygram::bot::Bot;
///
/// # fn main() -> Result<(), Box<dyn std::error::Error>> {
/// // Assuming the environment variables are set
/// let bot = create_bot()?;
/// // Use the bot...
/// # Ok(())
/// # }
/// ```
/// Send a message to the chat associated with the bot.