Try: Move the CSS for the outline button :hover style to theme.json

[carolinan]

Description
In this PR I am moving the CSS for the hover style for the outline button variation to theme.json.
Note, I was not able to make it work with the > combinator so I removed it. Open for alternatives.

The PR also deletes the CSS file and the PHP function twentytwentyfive_block_stylesheets()

Closes #413

Testing Instructions

Add two buttons with the outline style variation, one with and one without a background color.
Add links to the buttons.
Hover over the button that does not have a background. Expected: The background color changes slightly.
Hover over the button that has a background color. Expected: The background does not change.

[github-actions]

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[github-actions]

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Co-authored-by: carolinan <[email protected]>
Co-authored-by: juanfra <[email protected]>
Co-authored-by: richtabor <[email protected]>

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[juanfra]

Thanks Carolina, it is working well to me 🚀

Screen.Recording.2024-09-28.at.10.37.32.mov

I believe we don't need the combinator to add such specificity. It should work well with these changes, as the CSS is specific enough.