Moved the eightballAnswers slice to the package level so it can be modified by the eightball function.
Added logic to the eightball function to handle "add " and "remove " prefixes in the message text. If the message starts with "add ", the rest of the message is added as a new response. If the message starts with "remove ", the rest of the message is removed from the list of responses if it exists.
Now, users can add or remove custom responses by sending messages like "add My custom response" or "remove My custom response".
Now, users can add or remove custom responses by sending messages like "add My custom response" or "remove My custom response".