fix: Login without validating any email or password

[anwesha2002]

Title and Issue number

Title : Login without entering any email or password
Issue No. : #1135

Code Stack : HTML, CSS, JS

Close #1135

Description

This PR adds a new feature of validation check for email and password in the frontend, matching the registered email and password if matched then successful login otherwise blocked
If user is registered with the same email then blocks the re-registering with the same email
Added a blocked banner like success banner

Video/Screenshots (mandatory)

Recording.2024-08-01.083328.mp4

Recording.2024-08-01.083534.mp4

Type of PR

• Bug fix
• Feature enhancement
• Documentation update
• Other (specify): __None ______

Checklist:

• I have performed a self-review of my code.
• I have commented my code, particularly in hard-to-understand areas.
• I have tested the changes thoroughly before submitting this pull request.
• I have provided relevant issue numbers, screenshots, and videos after making the changes.
• I have gone through the contributing.md file before contributing

Additional context:

##Are you contributing under any Open-source programme?

• I am contributing under GSSOC'24
• I am contributing under VSOC'24

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[github-actions]

Hi @anwesha2002! Thank you for your valuable contribution! Our team will review it and get back to you soon.

[apu52]

@anwesha2002 good work