Feat: Improve warnings on login and SignUp page

[techy4shri]

Describe the feature

Currently, the warning appears as a pop up, one after the another. I can enhance it so that it appears as either a callout in the form or as a big popup in the middle of the screen using sweetalert2. This will make it more easy for the user to notice it and know which fields are required.

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• [X] I'm a GSSOC'24 contributor
• [X] I want to work on this issue

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[SUGAM-ARORA]

@techy4shri Issue assigned to you