Rename Twitter to X in documentation

[leonidasmi]

Fixes https://github.com/Yoast/reserved-tasks/issues/207

Summary

• Renames most Twitter references in documentation to X, to accompany https://github.com/Yoast/reserved-tasks/issues/115

Relevant technical choices

Technical choices that affect more than this issue:

Test instructions

This PR can be acceptance tested by following these steps:

Homepage (overview)

• Confirm that Twitter tags have become X tags:

  Metadata API

• Confirm that Twitter presenters have become X presenters:

  Rest API

• Confirm that in the example output, we have x.com in the sameAs attributes:

  Surfaces API

• Confirm that all Twitter references in variable descriptions have become X references:

  Deprecated filters and actions

• Confirm that Twitter image is called now X image:

  Integrating Yoast SEO

• Confirm that Twitter tags have become X tags:

  Controls - Overview

• Confirm that all Twitter references in the options descriptions have become X references:

  Schema - Specification

• Confirm that the Twitter reference in the Other consumers section has become an X reference:

• also confirm that in the three examples, of the Company Homepage, the article, with an author, on a company website and the product in a WooCommerce store, we show x.com in the sameAs attributes.

  Schema - plugins - Yoast SEO for Shopify

• Confirm that in the examples, of the core logic, we show x.com in the sameAs attribute.

---

X feature

• Confirm that the Twitter reference in the sidebar, under Yoast SEO features has become an X reference:
• Also confirm that the title has become now Yoast SEO X Tags: Functional specification
• And following are all the Twitter references that have become X references (highlighted by the browser search, to help identification):

Note, the A user-defined "X description" value for the page. and A user-defined “Facebook image” in the Social tab of the Yoast metabox in an og:image tag changes and be critical of them.

Quality assurance

• [ ] Security - I have thought about any security implications this code might add.
• [ ] Performance - I have checked that this code doesn't impact performance (greatly).
• [ ] Caching - I have analyzed the caching methods that this code touches and have added instructions to deal with those.
• [ ] Tested - I have tested this code to the best of my abilities.
• [ ] Automated tests - I have added unit tests to verify the code works as intended.
• [ ] Testability - I have added unique ids to elements, so they can be located in automated testing.
• [ ] I have altered a filename.
  • [ ] I have adjusted the ID property accordingly and updated all internal links.
  • [ ] I have added the redirect to the _redirects file in the root of the project.

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