templates: separate record detail content

[tmorrell]

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Description

This PR splits the record detail template into the page template and a new template for the actual record content. This makes the template cleaner and more reusable, and is in preparation for being able to enhance the landing page in https://github.com/inveniosoftware/invenio-app-rdm/issues/2953

This PR does not make any changes to the templates, just splits the content into two.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• [x] I'm aware of the code of conduct.
• [x] I've created logical separate commits and followed the commit message format.
• [x] I've added relevant test cases.
• [x] I've added relevant documentation.
• [x] I've marked translation strings.
• [x] I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
• [x] I've NOT included third-party code (copy/pasted source code or new dependencies).
  • If you have added third-party code (copy/pasted or new dependencies), please reach out to an architect.

Frontend

• [x] I've followed the CSS/JS and React guidelines.
• [x] I've followed the web accessibility guidelines.
• [x] I've followed the user interface guidelines.

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1. You license your contribution under the same terms as the current repository’s license.
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This PR was automatically marked as stale.

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This PR was automatically marked as stale.

[github-actions[bot]]

This PR was automatically marked as stale.