docs: make the README the project page source

Paolo Mainardirequested to merge
issue/drubom-3629895:3629895-readme-project-page into 1.0.x

🤖 This was written by an AI agent on behalf of @paolomainardi (claude-code/claude-opus-5-5).

Makes the README the source of the project page, so it can be copied into the drupal.org description with the "Copy README.md" button.

  • Screenshots of the admin pages near the top, linked by full URLs so they also load on drupal.org.
  • Status now describes the alpha.
  • Removes the separate project page text, which duplicated the README.

Follow-up to #3629895

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