Feedback set 2

[danivijay]

• [x] hide login/signup if token is present
• [x] redirect from login/signup to home if token is present
• [x] delete token and redirect to login/signup if token verification fails
• [x] add logout button functionality if token is present
• [x] After adding a product, redirect user to dashboard on success
• [ ] validation on add product

[ashinpchandran]

Fixed "After adding a product, redirect user to dashboard on success " in #52

[ashinpchandran]

"redirect from login/signup to home if token is present"

Fixed in #54

[ashinpchandran]

"delete token and redirect to login/signup if token verification fails"

Deleted token and redirects to home if token verification fails in #53

[ashinpchandran]

"add logout button functionality if token is present"

Fixed in #54