Add "Continue with Google" Button and Update Sign-Up Form Label

[abhishekrajput-web]

Added a "Continue with Google" button to both the sign-in and sign-up forms for enhanced user convenience.
Changed the label in the sign-up form from "Sign In" to "Sign Up" to correct the form's purpose and improve user clarity.
These updates are aimed at making the user experience smoother and more intuitive.

Kindly review and merge this request at your convenience. Thank you for your time and consideration!

[github-actions]

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[github-actions]

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[abhishekrajput-web]