Offline mode (#403)

* offline mode

* fixes, mixpanels, etc

* changes

* prettier

* rev

* actions

theseus_gui/src/store/notifications.js

@@ -23,3 +23,7 @@ export const handleError = (err) => {
   })
   console.error(err)
 }
+
+export const handleMixpanelError = (err) => {
+  console.error(err)
+}