Update final screen UI

[ovitrif]

This task is to update the final screen of the site creation flow.
The screen is shown as a confirmation when the user completed the flow.

For paid domains, additional info — on the purchase receipt as well as the possibility of the site not being directly accessible through the custom domain — needs to be communicated to the user.

Definition of Done

General

• Title typeface is aligned with the other screens in the flow 7964c3e
• Decrease title font size in Landscape 4b70be2
• Rounded corners & other tweaks to align with the design spec 5483c44

Paid Domains only

• Inform the user in the subtitle that we've emailed their receipt 199a4f8
• Inform the user via a new caption text under the card to acknowledge the possible delay until the site is reachable via the custom domain 199a4f8
• Fix Replace mapped subdomain with the custom domain at the top of the card 062b0ca

Expected UI

Before	Free	Paid

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Note:

• Other changes are out of scope and part of other tasks
• All development should be behind the feature flag