Add file download option to link-button

[FilippoOggionni]

Describe the problem/need and solution

Context
Currently, through the link-button command, it is possible to specify either a :type: ref or a :type: url.

Problem / Idea
I would propose to add an option to download a file, as already possible via the sphinx command :download: link_text <filepath>

Solution
I am not sure if it is possible, but this function could be changed to account for a file download.

Benefit
Download files through buttons would be a nice feature.

Guide for implementation

No response

Tasks and updates

No response

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