CC @rshrc

We should have a single sign in page for the club. It will be a form where people can enter in their UFL email address and click sign in. It will then communicate to the backend with a REST call (don't worry about that for right now), where it will get one of three messages:

1. Sign in complete, existing member
   • In this case just show a success message and empty the fields so someone else

Do something like this. No need to 100% follow the example given.