Production rollout of Organization sign-in
## Problem Statement In https://gitlab.com/groups/gitlab-org/-/work_items/19425 we delivered the first iteration of Organization sign-in: a two-step flow for username/password. We need to gradually roll out this feature on production for gitlab.com and communicate the change internally and externally as we move closer to active user adoption of Organizations. ## Exit criteria * A user can sign in to an Organization they belong to by providing a username and password * Documentation clarifies how sign-in works in an Organization context * Developer documentation explains how this login flow works ## DRI @peterhegman
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