Merge branch '76-remove-add-contact-button-once-the-user-logs-out' into 'master'

Don't show add button if the user is not logged in

Closes #76

See merge request sensor-system-management/frontend!98

pages/devices/_deviceId/contacts/new.vue

@@ -47,6 +47,7 @@ permissions and limitations under the Licence.
         align-self="center"
       >
         <v-btn
+          v-if="isLoggedIn"
           small
           color="primary"
           :disabled="selectedContact == null"

pages/platforms/_platformId/contacts/new.vue

@@ -50,6 +50,7 @@ permissions and limitations under the Licence.
         align-self="center"
       >
         <v-btn
+          v-if="isLoggedIn"
           small
           color="primary"
           :disabled="selectedContact == null"