Instead of showing the signup form and returning an internal error on
submit, the SignUpPage now queries signUpEnabled upfront and displays a
friendly message explaining that registration is not available, with a
link back to login.
Adds a signUpEnabled GraphQL query field on the connect/v1 API and
handles ErrSignupDisabled as a FORBIDDEN error in the SignUp resolver.
Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>
76f6c8f9d1