Improve login system

[mathiasayivor]

Closes #36

👨‍💻 Changes proposed

• Changed data type for isLogged from boolean to object which contains data that can be used for validation after a successful login
• Changed code in Login.jsx to be compatible with the new state
• Changed code in App.js to be compatible with the new state
• Added a new route to server for storing loginIds that were generated after user logs in, which would be validated to ensure that users don't forge their own loginId

✔️ Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• This PR does not contain plagiarized content.
• The title of my pull request is a short description of the requested changes.

📄 Note to reviewers

📷 Screenshots

[vercel]

Someone is attempting to deploy a commit to a Personal Account owned by @Dun-sin on Vercel.

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[Dun-sin]

app.js, login.jsx looks good, some discussions are needed for the backend

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 Summary: 👌 This code looks good

[mathiasayivor]

Made changes to backend as discussed

[Dun-sin]

Looks good

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 Summary: 👌 This code looks good