feat: add github sign-in feature

[abhishek0wb]

This pull request implements the GitHub sign-in feature as requested in the issue. Users can now sign up or log in using their GitHub account.

Closes #101

[vercel]

Someone is attempting to deploy a commit to the AJEET PRATAP SINGH's projects Team on Vercel.

A member of the Team first needs to authorize it.

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Abhishek Srivastava seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Abhishek Srivastava seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[apsinghdev]

@abhishek0wb nice work! can you please also add a screenshot/screen recording of the changes?

[abhishek0wb]

clip.mov

[abhishek0wb]

Superseded by #107