Add API for Deleting User and Associated Notes

[shubham-mehta-002]

Description: This pull request implements a new API endpoint to facilitate the deletion of a user along with all their associated notes.

Changes Made: New API Endpoint:

Endpoint: DELETE /delete-user

Functionality: Deletes all notes associated with the specified user ID. Deletes the user from the database. Returns a confirmation message.

Authorization Checks: Ensures that only the authenticated user can delete their own account .

Error Handling: Properly handles scenarios where the user does not exist, returning appropriate HTTP status codes and messages.

On successful deletion:

• The user is redirected to the signup page.
• A success notification is displayed to inform the user of the successful deletion.

https://github.com/user-attachments/assets/237d53e1-13df-4084-b7ac-af10b04fd01a