Remove outdated domain transfer page

[fditrapani]

Problem

@nuriapenya found this old transfer page:

It can be accessed via: https://wordpress.com/domains/add/use-your-domain/{yoursite}. According to tracks (p1743105111403969/1743090107.071329-slack-C08CT3M197W), this page isn't used anymore. There's no way to access it as far as we can tell.

This is the page we currently link to for the same thing:

Let's remove the old one

Where

https://wordpress.com/domains/add/use-your-domain/{yoursite}

[github-actions]

OpenAI suggested the following labels for this issue:

• [Feature Group] Emails & Domains: The issue pertains to an outdated domain transfer page, which falls under domain management features.
• [Feature] Domain Transfers: This label is relevant because the issue directly involves the removal of an old page related to domain transfers.
• [Feature] Domain Management: The outdated page is part of the broader context of managing domain settings and related features.