added function to clear session storage on logout

src/Store.js

@@ -81,10 +81,13 @@ function reducer(state, action) {
           currentUser:action.login
     }
     case 'USER_LOGGED_OUT':
+        sessionStorage.clear()
         return {
             ...state,
             userIsLoggedIn:action.userLoggedOut,
-            currentUser:action.login
+            currentUser:action.login,
+            userAgreedToPublicationTerms: false,
+            userAgreedToPublicationPermissions: false
         }
     case 'USER_AGREED_TO_PUBLICATION_TERMS':
         return {