Redirect brand new user to originating article after going through onboarding

[pkfrank]

Is this feature related to a problem? Please describe.

As a logged-out visitor who hits a "registration" CTA while attempting to take an action (reaction, comment, etc.) from an article page, it's currently too easy for me to get "lost" once I go through onboarding.

Describe the solution you’d like

When a brand new user hits a registration CTA from an article page (or a billboard on that article page), they should be redirected to the originating article page after going through /onboarding.

Definition of Done

• Implement the logic to keep track of the originating article page as the new user starts the /onboarding process
• Upon completion of the onboarding process, redirect the new user back to the originating article page

[github-actions]

Thanks for the issue, we will take it into consideration! Our team of engineers is busy working on many types of features, please give us time to get back to you.

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[benhalpern]

Assigning myself, I'll make this work.