replaced all alerts with toasts

[Codesmith28]

• Add toast notifications for team joining and deletion
• Refactor joinTeam and getOut functions, add NotifToast component
• Add NotifToast component and use it for displaying success and error messages

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Name	Status	Preview	Updated (UTC)
leetcode-leaderboard	✅ Ready (Inspect)	Visit Preview	Dec 28, 2023 7:31am