Added OTP verification for signup

[Joyosmit]

What does it fix?

Fixes #9 . When signing up users get a OTP which they need to enter for verification.

What features does it add?

1. It is implemented using nodemailer.
2. If OTP verification is not done, user cannot sign in.
3. If user tries to sign in without verifying, user is prompted to do OTP verification first.
4. OTP is valid for 10 minutes.

Screen recording for normal sign up flow:

Style.Share.-.Google.Chrome.2024-05-29.19-45-50.mp4

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
style-share	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 31, 2024 5:19am

[github-actions]

Thank you for submitting your pull request! 🙌 We'll review it as soon as possible. In the meantime, please ensure that your changes align with our CONTRIBUTING.md. If there are any specific instructions or feedback regarding your PR, we'll provide them here. Thanks again for your contribution! 😊

[VaibhavArora314]

this looks good but since there are so many changes, I will take some time to review it

[Joyosmit]

Sure, pls take your time.

[VaibhavArora314]

Hey so upon closer inspection I found that we are sending the jwt token on the user sign-up route and updating it in the recoil state after verifying the user but this has a security loophole as the user can inspect the frontend application and get the jwt token without verifying the email id and use it further.

So I suggest that we should send the jwt token in the verify route itself and not in the sign-up route in the backend.

[Joyosmit]

Alright. I'll make that change.

[Joyosmit]

For this to work, you need to have -

1. EMAIL_USER = youremail@gmail.com
2. EMAIL_PASS = <16character app password>
   To get app password, first enable 2 step-verification on your google account, then set a app password(it will be of 16 characters).

Also pls the the GSSoC and Level 3 labels.

[github-actions]

🎉 Your pull request has been successfully merged! 🎉 Thank you for your valuable contribution to our project. Your efforts are greatly appreciated. Feel free to reach out if you have any more contributions or if there's anything else we can assist you with. Keep up the fantastic work! 🚀