[skip ci] no relevant tests
It's been there for a while. `flex-start` causes all items to stick to one side and be misaligned if they have different heights.
`align-items` isn't actually needed in this area when the goal is centered vertical alignment, however, unsetting it _could_ break items' height. I couldn't make it do that, but to be safe I kept it and only replaced the value.
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There's no difference when they're broken into two rows, on mobile.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6541
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Reviewed-by: Otto <otto@codeberg.org>
Co-authored-by: 0ko <0ko@noreply.codeberg.org>
Co-committed-by: 0ko <0ko@noreply.codeberg.org>
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