Implement Sign-Out Functionality for Volunteer Portal

[DattatreyaBadugu]

We need to implement a secure Sign-Out feature for the volunteer web application to allow users to log out of their session safely and return to the homepage or login screen.

Acceptance Criteria:
A visible and accessible "Sign Out" button is present in the UI.

On clicking Sign Out:

The user session/token is invalidated or removed.

User is redirected to login or landing page.

Local storage / cookies are cleared of any user-related data.

[Ramyasahithya]

Worked on the volunteer model changes with respect to the database (volunteer_detail)

[Ramyasahithya]

working on the code changes related to the volunteer model

[keerthireddy1612]

Completed the implementation part of signOut functionality, need to do testing .