provide more details on programmatically sign-in

[waltcow]

https://docs.logto.io/docs/recipes/interact-with-management-api/
there are no example on programmatically sign-in with interact-with-management-api,
and the api doc is missing response details, it is so hard to play with the management-api

[gao-sun]

the doc is incorrect, we don't support programmatically sign-in yet. @simeng-li can you help update it?