Finalize mockups for standalone domain purchase screen

[anneforbush]

First round of mocks: https://share.getcloudapp.com/OAuJyqnx

[anneforbush]

@davemart-in Don shared some feedback in the Slack channel that I'll re-post here:

It might also help if this screen doesn't use the same layout as the previous domain step

The thinking behind this is that differentiating the look/feel of the screen a bit from the original domain step in the flow might help the offer stand out more and help users view this offer as different from the step they just completed.

[davemart-in]

Here are the updates that I made based on the other feedback:

I'm definitely open to layout changes, but this direction feels solid to me for a v1.

[davemart-in]

cc @rickybanister while I'm out for a few days.

[github-actions]

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