[AP-143] Remove all references to the refresh token from the technical documentation

[pauldougan]

AP-143

Why

We are deprecating the refresh token and want to ensure that relying party developers do not use it.

What

Remove all reference to the refresh token and the offline_access scope from the technical documentation content:

• https://docs.sign-in.service.gov.uk/how-gov-uk-one-login-works/#understand-the-technical-flow-gov-uk-one-login-uses
• update the diagram at https://docs.sign-in.service.gov.uk/how-gov-uk-one-login-works/#understand-the-technical-flow-gov-uk-one-login-uses to remove reference to the refresh token
• https://docs.sign-in.service.gov.uk/before-integrating/choose-which-user-attributes-your-service-can-request/#choose-which-scopes-your-service-can-request
• https://docs.sign-in.service.gov.uk/integrate-with-integration-environment/authenticate-your-user/#make-a-post-request-to-the-token-endpoint

Technical writer support

Yes

How to review

• check out the branch
• run the middleman server locally
• review modified pages and diagrams
• ensure overall consistency of the documentation

[pauldougan]

@philf999 @uche234 (can you confirm on the PR that you are happy with the changes then we can hand this over to the tech writers

[philf999]

Looks good to me

[uche234]

All references to the Refresh token were removed. Looks great.

[ethanmills]

I don't see any changes to that diagram?

[pauldougan]

@ethanmills this is an old draft branch which I need to kill off the actual pr is #185