Improve signup UX

DESCRIPTION TBD

User details tab

• email cannot be changed
• signify optional versus required
• SAVE button should say SAVE AND NEXT
• SAVE AND NEXT saves, then opens "password" tab

Password tab

• rename to "Set Password"
• add information about password constrains
• live password check before saving, optionally
• "verify password" second text area

Change password - Set Password update password should be “SAVE” and that takes us automatically to dashboard