Added email verification to signup workflow, integrated auth api from…

… backend. (#153)

* Added email verification to signup workflow, integrated auth api from backend.

Now frontend just needs to call createNewUser() from
src/services/AuthService to start the signup workflow, then finishes it
off with email verif. being handled in frontend.

* Added try catch for calls to a firebase service in signup's handleSubmit.

* Fixed duplicate imports in SignUpPage.

Rebase modal_refactor's 3 commits onto master (in progress)

src/services/api/.openapi-generator/VERSION

@@ -1 +1 @@
-5.0.0-beta
+5.0.0-beta2