fix: availability update

[ruilopesm]

No description provided.

[reviewpad]

AI-Generated Summary: This pull request includes changes made to the EventPage component in the file apps/app/pages/event/[id].tsx. The purpose of the changes is to fix updating of availabilities, specifically focusing on simplifying and refactoring the code for better efficiency and readability.

The updates included removing unused states such as 'availabilities' and 'mentors', and optimizing the useEffect hook that was connected with the 'availabilities'. In addition, modifications were made to the isMentorAlreadyRegistered and changeMentorAvailability functions, which now use the refactored list of mentors instead of 'availabilities'. The overall changes have resulted in a net reduction of lines of code enhancing maintainability and overall performance.

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