fix(theme): keep details-list custom field links inline

[TahaKhan998]

Stop forcing details-list anchors to display:block so multi-value custom fields like experiments stay on one line while still wrapping long values on dd.

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Description

Closes CERNDocumentServer/cds-rdm#880

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[palkerecsenyi]

Presuming you've tested this thoroughly locally, it looks good to me! Did you also check on mobile to ensure it looks okay?