feat: new flow with authorize page and custom code in auhtorize and credential endpoints [skip ci]

[matteo-cristino]

• feat: first draft of authorize web page
• fix: hide old autorize api
• feat(public): added precondition for authorize page
• feat(authz_server): API that given request_uri returns credential type
• fix: name and metadata of ru_to_toc
• feat: authorize now retrieve the type of credential from the request_uri
• fix(authorize): return value with window.parent.postMessage
• fix: catch error on login
• feat(authz_server): API that update auth_details and return auth_code
• feat(credential): credential is now a chain and change the custom code based on the credential requested
• fix(auhtorize): produce and return auth_code after login
• fix: restore old well-known files modified by mistake
• fix: format of well-known
• fix(credetial): file and varibale names
• test: add example of custom code for AS and CI