Login Page: connect to backend auth API

[DieDyeDai]

Acceptance Criteria:

New users should be able to click on the link at the bottom of the login page to navigate to the signup page.
After signing up successfully, they should be redirected to the login page.
Returning users should be able to enter their credentials and log in.

Upon logging in, users should land on the homepage.
Backend API endpoints can be found in the README.md in the backend.

[frey-mz]

this connection should:

• make a registration call
  also, we should store the language setting locally, and once the registration call is registered
• make a settings push call