feature update : Login, SignUp, Logout feature added

[anwesha2002]

Title and Issue number

Title : Login / Sign up page was not working.
This PR adds Login, SignUp, Logout feature

Issue No. : #320

Close #320

Changes Made

1. Sign Up working feature
2. Login working feature
   3.Logout button replaces the Login button in navbar after user signin/signup
   4.logout feature
3. proper routing for signup user and non-signup user.
4. Sign In credentials checking for wrong user credentials
5. Shows alert if a person tries to Signup with the same account, that they have already created account .
6. is not compromised with any of the styling element

Screenshots (if applicable)

Checklist

• [ x] I have tested these changes locally.
• [x ] I have reviewed the code and ensured it follows the project's coding standards.
• [ x] I have updated the documentation (if necessary).
• [x ] I have read the contributing guidelines.

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Name	Status	Preview	Comments	Updated (UTC)
shop-nex	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 20, 2024 9:05pm

[anwesha2002]

@JiyaGupta-cs @Vansh-Choudhary It's been months I made this PR check it and merge please