Cleaning up data fetching on mount

[Aztriltus]

In the DeployedSiteCard.tsx component, it's using useEffect to do an async/await fetch to getPages. In conjunction to #42, I think we can improve the resilience by cleaning up the data fetching on mount.

In situations where the component is unmounted before the fetch is completed, it might result in some issues. I think it'll be good to try using AbortController to cleanup the fetch. I saw a good example here which also uses try/catch block: https://dev.to/pallymore/clean-up-async-requests-in-useeffect-hooks-90h