Update 'Get Started' document to give access to Release app
Update 'Get Started' document to give access to Release app

Developers without production access can be given access to the
production release app, so we should document how they can gain access
by being given a non-admin Signon account in production.

alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs,alphagov/govuk-developer-docs