ENH: Add `download` as clickable ref type for Cards

[mmcky]

Describe the problem/need and solution

Context

We would like to add a Card that has a clickable download of the PDF for the website.

:ref: downloads/file.pdf
:link-ref: download

that would then support linking to a file for download

Problem / Idea

I have tried using the sphinx download role in the title but this doesn't seem to be passed through the sphinx

::::{grid} 2
:::{grid-item-card} {download}`PDF <downloads/file.pdf>`
:img-background: img/betweenness_centrality_1.pdf

but this approach doesn't look very nice. So it would be nice to have :link: support for download files for the whole card to be clickable

Solution

TBD

Benefit

Adds useful functionality to cards

Guide for implementation

No response

Tasks and updates

No response

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