Re-enable frontend authentication and add backend authentication

[aschey]

As an admin, I need to be able to log in to the application securely so that other people cannot access the UI or the API of the application.

Acceptance Criteria:

• [ ] The frontend authentication created in this ticket is re-enabled: https://app.zenhub.com/workspaces/ksf-5f23520d91f7ee00134cbaf6/issues/the-difference-engine/ksf/130
• [ ] The API rejects any call made to it without supplying a valid auth token obtained through the login process

[sowmya20189]

Merge conflicts on other tickets - check and come back on the ETA by 11/29

[tkhutch]

Branch with current code work: https://github.com/the-difference-engine/ksf/tree/324-google-authentication