Sign-in screen: Updates to improve intelligibility

[mpmikesell]

IF WE DON'T KNOW IF YOU ARE NEW OR RETURNING:

Show two scenarios:


New to the app? Create your account | Already have an account? Sign in

IF WE KNOW YOU'RE RETURNING:

Skip the sign-in page!

1. Create your account (new users)

   NAME

   EMAIL

   PASSWORD

   Create a password that's just for this app. Passwords must have at least 8 characters and should use at least one number.

   [ SIGN UP ] [hyperlink]

    Already have an account? Sign in! [hyperlink]
   

Provide helper text to let people know the parameters of the password to be created.

@shengyu - what are the actual password rules we're using? Do we have a message to handle failed password creation?

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2. Sign in (existing users)

   NAME

    EMAIL
   

   PASSWORD

   Forgot password [hyperlink]

New to the app? Create your account! [hyperlink]