Docs for stack role assumptions

[peterdeme]

Description of the change

Introduction of the new stack role attachments feature and the deprecation of the administrative flag.

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[KiraLempereur-Spacelift]

These look beautiful! Let's get them all merged in :)

[peterdeme]

@KiraLempereur-Spacelift not yet, we need to wait a bit until the release day

[KiraLempereur-Spacelift]

@KiraLempereur-Spacelift not yet, we need to wait a bit until the release day

Perfect, we should be ready for when release day comes then! Thanks so much for handling these.