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 #2953

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

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[github-actions]

This PR was automatically marked as stale.

[utnapischtim]

is the idea to make record_content.html overridable?

[tmorrell]

I'd say embeddable instead of overridable. If you take a look at #2953, having the record content be separate would facilitate a tabbed interface for the landing page. There is probably more discussion needed on the specific interface....but I think this template change makes the templates more flexible in general.