Switch to css grid instead of legacy column classes in media reuse

[zackkrida]

Fixes

Fixes #1091 by @zackkrida

Description

Switches the media reuse columns to use flexbox for layout. Observe an image and/or audio single result on desktop and mobile; confirm the correct appearance.

Testing Instructions

Checklist

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[obulat]

LGTM!

[krysal]

It would be great to remove the old Bulma classes, but this solution causes more movement between columns when switching between VCopyLicense tabs.

The left column is too narrow when in the HTML tab, can we prevent this?

[zackkrida]

ah, thanks @krysal ! I can easily make the columns the same width, i can't believe i missed that 😅

[krysal]

Nice, perfect!